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Championswimmer / low-level-design-problem.

Case studies (with solution codes) for Low Level System Design problems

• Updated May 7, 2022

vinimrs / spring-boot-clean-architecture

An analysis of a clean architecture implementation in a spring boot application.

• Updated Nov 7, 2023

ohbus / retail-banking

Consumer Banking Application

• Updated Sep 14, 2022

AhmetFurkanDEMIR / Boyner-Case-Study

Boyner Case Study

• Updated Jun 21, 2022

mobile-hcmus / TikTokCloneProject

TopTop - A native TikTok Clone Android App built with Java

• Updated Oct 8, 2023

ghareeb-falazi / SCIP-CaseStudy-2

A case-study that shows how the Smart Contract Locator (SCL), the Smart Contract Description Language (SCDL), and the Smart Contract Invocation Protocol (SCIP) can be used in combination to support the integration of heterogeneous multi-blockchain setups into client applications.

• Updated Mar 2, 2023

lorenzokyne / Metodi-Avanzati-di-Programmazione---Caso-di-studio-2017-2018

Caso di studio Metodi Avanzati di Programmazione

• Updated Sep 6, 2018

veysiertekin / wiremock-case-study

A case-study for using wiremock on docker environment. Wiremock proxy stubbing example.

• Updated Mar 12, 2018

decimozs / verdant-vibes

A plant-focused e-commerce desktop application was created using Java, Java Swing, JUnit testing, and local database tailored specifically for plant-related enterprises.

• Updated Jun 20, 2023

soloalex1 / sqlist

Uma aplicação de lista de tarefas como estudo de caso sobre o uso do SQLite no Android.

• Updated Jun 28, 2019

alphaolomi / download-manager

A Robust Download Manager⏬ built using ☕Java

• Updated Mar 26, 2022

siddeshbb / userpersonalisation-casestudy

User Personalisation Case Study

• Updated Jun 20, 2019

Dare-marvel / Big-Data-Analytics--BDA--

💾 Welcome to the Big Data Analytics Repository! 📚✨ Immerse yourself in a carefully curated reservoir of knowledge on Big Data Analytics. 🌐💡 Explore the intricacies of deriving insights from vast datasets and navigating powerful analytics tools. 🚀🔍

• Updated May 31, 2024

YusufDagdeviren / Akbank-Web3-Practicum

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• Updated Sep 9, 2022

ManasMalla / PayPal-Clone-CaseStudy

PayPal (Payment Management System): A simple payment management system, inspired by PayPal, in the exact language in which the fin-tech giant started out.

• Updated Apr 1, 2024

KeYProject / ips4o-verify

Case Study of the Verification of In-Place Parallel Super Scalar Samplesort Algorithm in Java

• Updated Aug 21, 2024

berksudan / Loan-Data-Report-with-AWS

Built a distributed system which completes several objectives with given data to generate loan reports using Amazon Web Services, Apache Spark, Java and Python.

• Updated Nov 3, 2020

hkristanto / JHotDraw

• Updated Jun 14, 2017

KeYProject / DualPivotQuickSort

• Updated Jun 13, 2023

KeYProject / rbtree-verification

A Java implementation of red-black trees, verified with KeY.

• Updated Sep 11, 2023

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50 Java Projects with Source Code for All Skill Levels

By Faraz - July 20, 2024

50 Java projects with complete source code, suitable for beginners to experts. Dive into practical coding with these hands-on examples.

Java , being one of the most popular programming languages globally, offers a vast array of opportunities for enthusiasts to practice and enhance their coding skills. Engaging in practical projects is one of the most effective ways to master Java programming. Here, we'll explore 50 Java projects with source code across different levels of complexity, suitable for beginners, intermediates, and advanced learners.

Table of Contents

Introduction to Java Projects

Java projects provide hands-on experience and are instrumental in reinforcing theoretical concepts. They offer a practical understanding of Java's syntax , structure, and functionality. Moreover, working on projects enables developers to tackle real-world problems, fostering creativity and problem-solving skills.

1. Calculator

Houari ZEGAI's Calculator project offers a great opportunity for beginners to delve into Java programming. This simple yet effective project helps learners understand fundamental concepts like variables, operators, and basic user input/output. With clear, commented code, ZEGAI's Calculator is a fantastic starting point for those new to Java development . By studying and tinkering with this project, beginners can grasp core principles while gaining confidence in their coding abilities.

2. Guess the Number Game

The "Guess the Number" game is a classic Java project suitable for programmers of all skill levels. This interactive game challenges players to guess a randomly generated number within a specified range. With simple yet engaging gameplay, the "Guess the Number" project provides an excellent opportunity for beginners to practice essential Java concepts while having fun.

3. Currency Converter

The Currency Converter project is a practical and useful Java application that allows users to convert between different currencies. This project is suitable for programmers at various skill levels, providing an opportunity to apply Java programming concepts in a real-world scenario.

In the Currency Converter project, users input an amount in one currency and select the currency they wish to convert it to. The application then retrieves the latest exchange rates from a reliable source, such as an API, and performs the conversion calculation. By implementing this functionality, learners can gain valuable experience working with APIs, handling user input, and performing mathematical operations in Java.

4. Digital Clock

The Digital Clock project is a straightforward yet engaging Java application that displays the current time in a digital format. This project is suitable for beginners and intermediate programmers alike, offering an opportunity to practice essential Java concepts while creating a useful utility.

In the Digital Clock project, programmers utilize Java's date and time functionality to retrieve the current system time and display it on the screen. By incorporating graphical user interface (GUI) components such as labels and timers, learners can create an interactive clock display that updates in real-time. This hands-on approach allows beginners to familiarize themselves with GUI programming concepts while practicing core Java skills.

5. ToDo App

The ToDo App project is a practical Java application that helps users organize their tasks and manage their daily activities efficiently. This project is suitable for programmers looking to develop their Java skills while creating a useful productivity tool.

In the ToDo App project, users can add tasks to a list, mark them as completed, and remove them as needed. By implementing features such as user input handling, task manipulation, and list management, learners gain valuable experience in Java programming fundamentals. Additionally, this project provides an opportunity to explore concepts like data structures, file handling, and user interface design.

6. QRCodeFX

QRCodeFX is an exciting Java project that allows programmers to generate QR codes dynamically. This project leverages JavaFX, a powerful library for building graphical user interfaces, to create an interactive application for generating and displaying QR codes.

7. Weather Forecast App

The Weather Forecast App project is an exciting Java application that provides users with up-to-date weather information for their location and other selected areas. This project combines Java programming with APIs to create a dynamic and user-friendly weather forecasting tool.

In the Weather Forecast App, users can input their location or select a specific city to view current weather conditions, including temperature, humidity, wind speed, and more. By integrating with a weather API, such as OpenWeatherMap, programmers can retrieve real-time weather data and display it in a clear and visually appealing format.

8. Temperature Converter Tool

The Temperature Converter Tool is a handy Java application that allows users to convert temperatures between different units, such as Celsius, Fahrenheit, and Kelvin. This project provides a practical opportunity for programmers to develop their Java skills while creating a useful utility for everyday use.

In the Temperature Converter Tool, users can input a temperature value along with the unit of measurement (e.g., Celsius, Fahrenheit, or Kelvin) and select the desired output unit. The application then performs the conversion calculation and displays the result, allowing users to quickly and easily convert temperatures with precision.

9. Word Counter Tool

The Word Counter Tool is a versatile Java application designed to analyze text and provide valuable insights into word frequency and usage. This project offers programmers a practical opportunity to hone their Java skills while creating a useful utility for text analysis.

In the Word Counter Tool, users can input a block of text or upload a text file, and the application will analyze the content to determine the frequency of each word. By utilizing Java's string manipulation capabilities and data structures such as maps or arrays, programmers can efficiently process the text and generate a comprehensive word count report.

10. Scientific Calculator

The Scientific Calculator project is an advanced Java application that provides users with a wide range of mathematical functions and operations beyond basic arithmetic. This project is ideal for programmers looking to expand their Java skills while creating a powerful utility for scientific calculations.

In the Scientific Calculator, users can input mathematical expressions, including functions such as trigonometric, logarithmic, and exponential functions, and the application will evaluate and display the result accurately. By leveraging Java's math libraries and implementing parsing algorithms, programmers can create a robust calculator capable of handling complex mathematical computations with precision.

11. Tic Tac Toe

The Tic Tac Toe project is a classic Java game that provides users with an opportunity to engage in a fun and strategic multiplayer experience. This project is perfect for programmers looking to apply their Java skills while creating an interactive game with simple rules and dynamic gameplay.

In the Tic Tac Toe game, two players take turns marking spaces on a 3x3 grid with their respective symbols (typically X and O), aiming to form a horizontal, vertical, or diagonal line of their symbols before their opponent. By implementing logic to handle user input, validate moves, and check for win conditions, programmers can create a fully functional and enjoyable game experience.

12. Drag and Drop Application

The Drag and Drop Application is a dynamic Java project that enables users to interact with graphical elements by dragging and dropping them across the application's interface. This project provides programmers with an opportunity to explore Java's graphical user interface (GUI) capabilities while creating an intuitive and interactive user experience.

13. Snake Game

The Snake Game project is a classic Java game that provides users with an entertaining and addictive gaming experience. This project offers programmers an opportunity to apply their Java skills while creating a dynamic and interactive game with simple yet challenging gameplay mechanics.

In the Snake Game, players control a snake that moves around a grid, consuming food items to grow longer while avoiding collisions with the walls of the grid or the snake's own body. By implementing logic to handle player input, update the snake's position, and detect collisions, programmers can create a compelling and immersive gaming experience.

14. Resume Builder

The Resume Builder project is a practical Java application designed to assist users in creating professional resumes efficiently. This project offers programmers an opportunity to apply their Java skills while developing a useful tool for individuals seeking to showcase their qualifications and experiences effectively.

15. Student Management System

The Student Management System project is a comprehensive Java application designed to streamline administrative tasks related to student information and academic records. This project offers programmers an opportunity to apply their Java skills while developing a robust and efficient system for managing student data.

In the Student Management System, administrators can perform various tasks such as adding new students, updating existing records, managing course enrollments, and generating reports. By implementing features such as database integration, user authentication, and data validation, programmers can create a reliable and user-friendly platform for organizing and accessing student information.

16. Rock Paper Scissors

The Rock Paper Scissors project is a classic Java game that provides users with a simple yet entertaining gaming experience. This project offers programmers an opportunity to practice their Java skills while creating a fun and interactive game of chance.

In the Rock Paper Scissors game, players compete against the computer by selecting one of three options: rock, paper, or scissors. The winner is determined based on the rules of the game: rock beats scissors, scissors beats paper, and paper beats rock. By implementing logic to handle player input, generate random computer choices, and determine the outcome of each round, programmers can create an engaging gaming experience.

17. Hangman Game

The Hangman Game project is a classic Java game that provides users with a challenging and engaging word-guessing experience. This project offers programmers an opportunity to practice their Java skills while creating a fun and interactive game of wit and strategy.

In the Hangman Game, players attempt to guess a secret word by suggesting letters one at a time. For each incorrect guess, a part of a hangman figure is drawn. The game continues until the player correctly guesses the word or the hangman figure is completed. By implementing logic to handle player input, manage the game state, and select random words, programmers can create an immersive gaming experience.

The Webcam Application project is a Java application designed to interface with a webcam device and capture video or images. This project offers programmers an opportunity to apply their Java skills while creating a versatile tool for webcam usage.

19. Attendance Management System

The Attendance Management System project is a comprehensive Java application designed to streamline attendance tracking and management processes in educational institutions or workplaces. This project offers programmers an opportunity to apply their Java skills while developing a robust and efficient system for managing attendance records.

In the Attendance Management System, administrators can perform various tasks such as recording attendance, generating attendance reports, managing leave requests, and tracking attendance trends over time. By implementing features such as user authentication, data encryption, and access control, programmers can create a secure and reliable platform for monitoring attendance data.

20. Chess Game

The Chess Game project is a Java application that offers users a classic and strategic gaming experience. This project provides programmers with an opportunity to apply their Java skills while creating a sophisticated and engaging game of chess.

In the Chess Game, players take turns moving their pieces across an 8x8 grid, aiming to capture their opponent's pieces and ultimately checkmate their opponent's king. By implementing logic to handle player input, validate moves, and simulate game states, programmers can create a challenging and immersive gaming experience.

21. Vehicle Rental Management System

The Vehicle Rental Management System is a comprehensive Java application designed to streamline the process of managing vehicle rentals for rental agencies or businesses. This project offers programmers an opportunity to apply their Java skills while developing a robust and efficient system for handling rental operations.

In the Vehicle Rental Management System, administrators can perform various tasks such as adding new vehicles to the inventory, managing rental reservations, tracking rental durations and payments, and generating reports. By implementing features such as database integration, user authentication, and data validation, programmers can create a reliable and user-friendly platform for managing vehicle rentals.

22. Quiz App

The Quiz App project is a Java application designed to provide users with an interactive and educational quiz experience. This project offers programmers an opportunity to apply their Java skills while creating a dynamic and engaging platform for quiz-taking.

In the Quiz App, users can choose from a variety of quiz topics or categories, such as science, history, literature, or general knowledge. The application presents users with multiple-choice questions related to the selected topic and provides instant feedback on their answers. By implementing logic to handle user input, track scores, and display quiz results, programmers can create an immersive and rewarding quiz experience.

23. Voting Management System

The Voting Management System is a sophisticated Java application designed to facilitate the management of voting processes in elections or organizational decision-making. This project offers programmers an opportunity to apply their Java skills while developing a secure and efficient system for managing voting operations.

In the Voting Management System, administrators can oversee various aspects of the voting process, including voter registration, ballot creation, voter authentication, vote counting, and result reporting. By implementing features such as user authentication, encryption algorithms, and audit trails, programmers can create a robust and tamper-resistant platform for conducting fair and transparent elections.

24. Electricity Billing System

The Electricity Billing System is a Java application designed to automate and streamline the process of managing electricity bills for customers. This project offers programmers an opportunity to apply their Java skills while developing an efficient and user-friendly system for billing and invoicing.

In the Electricity Billing System, administrators can perform various tasks such as adding new customers, recording meter readings, calculating electricity consumption, generating bills, and processing payments. By implementing features such as database integration, billing algorithms, and user interfaces, programmers can create a reliable and accurate platform for managing electricity billing operations.

25. Online Shopping Cart (E-Commerce Website)

The Online Shopping Cart project is a comprehensive Java application designed to provide users with a seamless and convenient online shopping experience. This project offers programmers an opportunity to apply their Java skills while developing a feature-rich and user-friendly e-commerce platform.

In the Online Shopping Cart, users can browse through a catalog of products, add items to their cart, and proceed to checkout to complete their purchase. By implementing features such as user authentication, product search functionality, shopping cart management, and secure payment processing, programmers can create a robust and reliable platform for online shopping.

26. Online BookStore

The Online Bookstore project is a dynamic Java application that provides users with a convenient platform to browse, search, and purchase books online. This project offers programmers an opportunity to apply their Java skills while developing a comprehensive and user-friendly e-commerce platform specifically tailored for books.

In the Online Bookstore, users can explore a vast catalog of books across different genres, authors, and topics. They can easily search for specific titles, view book details, read reviews, and add books to their shopping cart for purchase. By implementing features such as user authentication, secure payment processing, and order management, programmers can create a seamless and enjoyable shopping experience for book enthusiasts.

27. Connect4

The Connect4 Game project is a Java application that offers users a classic and engaging gaming experience. This project provides programmers with an opportunity to apply their Java skills while developing a strategic and entertaining game of Connect 4.

In the Connect4 Game, two players take turns dropping colored discs into a vertical grid with the goal of connecting four discs of their color horizontally, vertically, or diagonally. By implementing logic to handle player input, validate moves, and detect winning conditions, programmers can create an immersive and challenging gaming experience.

28. Event Management System

The Event Management System is a comprehensive Java application designed to streamline the planning and organization of events for various purposes, such as conferences, weddings, or corporate gatherings. This project offers programmers an opportunity to apply their Java skills while developing a versatile and efficient system for managing event logistics.

In the Event Management System, administrators can perform various tasks such as creating event schedules, managing guest lists, coordinating vendors and suppliers, and tracking expenses and budgets. By implementing features such as user authentication, calendar integration, and communication tools, programmers can create a centralized platform for planning and executing events seamlessly.

29. Puzzle Game

The Puzzle Game project is an engaging Java application that challenges users with a variety of mind-bending puzzles to solve. This project provides programmers with an opportunity to apply their Java skills while creating an entertaining and intellectually stimulating gaming experience.

In the Puzzle Game, players are presented with a series of puzzles, each requiring a unique solution or strategy to complete. These puzzles may include logic puzzles, pattern recognition challenges, maze navigation tasks, or spatial reasoning exercises. By implementing logic to generate puzzles, validate player inputs, and track progress, programmers can create a dynamic and immersive gaming experience.

30. Pacman Game

The Pacman Game project is a classic Java application that brings to life the iconic arcade game experience. This project offers programmers an opportunity to apply their Java skills while recreating the nostalgic and beloved gameplay of Pacman.

In the Pacman Game, players control the iconic character Pacman as they navigate through a maze, eating pellets and avoiding ghosts. The objective is to clear the maze of all pellets while avoiding contact with the ghosts, which will result in losing a life. By implementing logic to handle player input, control Pacman's movement, and manage ghost behavior, programmers can recreate the thrilling and addictive gameplay of Pacman.

31. Space Invaders Game

The Space Invaders Game project is a thrilling Java application that immerses players in an epic battle against invading alien forces. This project provides programmers with an opportunity to apply their Java skills while recreating the classic arcade gaming experience of Space Invaders.

In the Space Invaders Game, players control a spaceship at the bottom of the screen, tasked with defending Earth from waves of descending alien invaders. The player can move the spaceship horizontally to dodge enemy fire and shoot projectiles to eliminate the invading aliens. By implementing logic to handle player input, manage alien movement patterns, and detect collisions, programmers can recreate the fast-paced and addictive gameplay of Space Invaders.

32. Breakout Game

The Breakout Game project is an exhilarating Java application that challenges players to smash through rows of bricks using a bouncing ball and a paddle. This project offers programmers an opportunity to apply their Java skills while recreating the timeless and addictive gameplay of Breakout.

In the Breakout Game, players control a paddle at the bottom of the screen, tasked with bouncing a ball to break through a wall of bricks at the top. The player must maneuver the paddle to keep the ball in play and prevent it from falling off the bottom of the screen. By implementing logic to handle player input, simulate ball movement and collision detection, and manage brick destruction, programmers can recreate the fast-paced and exciting gameplay of Breakout.

33. Tetris Game

The Tetris Game project is an exciting Java application that challenges players to manipulate falling tetrominoes to create complete lines and clear the playing field. This project provides programmers with an opportunity to apply their Java skills while recreating the iconic and addictive gameplay of Tetris.

In the Tetris Game, players control the descent of tetrominoes—geometric shapes composed of four square blocks— as they fall from the top of the screen to the bottom. The player can rotate and maneuver the tetrominoes to fit them into gaps and create solid lines across the playing field. By implementing logic to handle player input, simulate tetromino movement and rotation, and detect line completions, programmers can recreate the fast-paced and challenging gameplay of Tetris.

34. Minesweeper Game

The Minesweeper Game project is a captivating Java application that challenges players to uncover hidden mines on a grid-based playing field while avoiding detonating any of them. This project provides programmers with an opportunity to apply their Java skills while recreating the engaging and strategic gameplay of Minesweeper.

In the Minesweeper Game, players are presented with a grid of squares, some of which conceal hidden mines. The objective is to uncover all the non-mine squares without triggering any mines. Players can reveal the contents of a square by clicking on it, and clues provided by adjacent squares indicate the number of mines in proximity. By implementing logic to handle player input, reveal squares, and detect game-ending conditions, programmers can recreate the challenging and thought-provoking gameplay of Minesweeper.

ChatFx is a Java-based chat application that provides users with a platform to engage in real-time text-based conversations. This project offers programmers an opportunity to apply their Java skills while developing a dynamic and interactive chat system.

36. Chrome Dino Game

The Chrome Dino Game Clone project is a Java application inspired by the classic side-scrolling endless runner game found in Google Chrome's offline page. This project offers programmers an opportunity to apply their Java skills while recreating the simple yet addictive gameplay of the Chrome Dino Game.

In the Chrome Dino Game Clone, players control a dinosaur character that automatically runs forward on a desert landscape. The objective is to jump over obstacles such as cacti and birds while avoiding collisions. By implementing logic to handle player input for jumping, detect collisions with obstacles, and generate random obstacle patterns, programmers can recreate the fast-paced and challenging gameplay of the Chrome Dino Game.

37. Web Scraping

Web scraping refers to the process of extracting data from websites. It's a valuable technique for gathering information from the web for various purposes, such as data analysis, market research, or content aggregation. In Java, developers can leverage libraries like Jsoup to perform web scraping efficiently and effectively.

Jsoup is a Java library that provides a convenient API for working with HTML documents. With Jsoup, developers can easily parse HTML, navigate the document structure, and extract relevant data using CSS selectors or DOM traversal methods.

38. Text Editor

A Text Editor is a fundamental tool used for creating, editing, and managing text-based documents. Building a Text Editor application in Java provides an excellent opportunity for programmers to apply their skills while creating a versatile and user-friendly tool for text manipulation.

In Java, developers can leverage libraries like JavaFX to create graphical user interfaces (GUIs) for their applications. JavaFX offers a rich set of features for building interactive and visually appealing desktop applications, making it well-suited for developing a Text Editor.

39. Tender Management System

A Tender Management System is a comprehensive software solution designed to streamline the process of tendering, from initial announcement to final contract award. This system facilitates the entire tender lifecycle, including tender creation, submission, evaluation, and contract management. Building a Tender Management System in Java presents an opportunity for developers to create a powerful tool that enhances efficiency and transparency in the tendering process.

40. Hotel Reservation System

A Hotel Reservation System is a software application designed to streamline the process of booking accommodations and managing reservations for hotels, resorts, or other lodging establishments. Building a Hotel Reservation System in Java provides developers with an opportunity to create a comprehensive solution that enhances the efficiency and customer experience of hotel management.

41. Train Ticket Reservation System

A Train Ticket Reservation System is a software application designed to facilitate the booking of train tickets and management of reservations for railway passengers. Building a Train Ticket Reservation System in Java provides developers with an opportunity to create a comprehensive solution that enhances the efficiency and convenience of train travel.

42. School Management System

A School Management System is a comprehensive software solution designed to streamline various administrative tasks within educational institutions. This system helps manage student information, class schedules, attendance records, grading, and communication between teachers, students, and parents. Building a School Management System in Java provides an efficient way to organize and automate processes, ultimately enhancing the effectiveness of school administration.

43. Banking System

A Banking System is a software application used by financial institutions to manage customer accounts, transactions, and other banking operations. This system facilitates activities such as account management, fund transfers, loan processing, and online banking services. Building a Banking System in Java involves implementing secure and efficient algorithms for managing financial transactions, ensuring data integrity and confidentiality, and providing a seamless user experience for customers.

44. Restaurant Management System

A Restaurant Management System is a software platform used by restaurants and food service establishments to manage various aspects of their operations, including order management, inventory control, table reservations, and billing. This system helps streamline restaurant workflows, improve efficiency, and enhance the dining experience for customers. Building a Restaurant Management System in Java involves designing user-friendly interfaces, integrating with point-of-sale devices, and implementing features such as menu customization, order tracking, and kitchen management.

45. Library Management System

A Library Management System is a software application used by libraries to manage their collections, circulation, and patron services. This system helps librarians track books, manage borrower information, automate check-in and check-out processes, and generate reports on library usage. Building a Library Management System in Java involves designing a database schema to store book and patron information, implementing search and retrieval functionalities, and providing a user-friendly interface for library staff and patrons to interact with the system.

46. Mail Sender

A Mail Sender is a software application used to compose, send, and manage emails. This tool facilitates communication by allowing users to send messages to one or more recipients over email. Building a Mail Sender in Java involves integrating with email protocols such as SMTP (Simple Mail Transfer Protocol) or using third-party email APIs to handle email delivery and management.

47. 2048 Game

The 2048 Game is a popular single-player puzzle game where players slide numbered tiles on a grid to combine them and create a tile with the number 2048. Building a 2048 Game in Java involves implementing game mechanics such as tile movement, tile merging, scoring, and game over conditions. Developers can use graphical libraries like JavaFX or Swing to create a user interface for the game.

48. Table Generator

A Table Generator is a tool used to create tables or grids with specified dimensions and content. This tool is often used in document preparation, web development, or data analysis to generate structured data displays. Building a Table Generator in Java involves designing a user interface for users to input table parameters such as rows, columns, and content, and then generating the table output dynamically.

49. Health Care Management System

A Health Care Management System is a software application used by healthcare providers to manage patient records, appointments, medical history, and other administrative tasks. This system helps streamline healthcare workflows, improve patient care, and enhance operational efficiency. Building a Health Care Management System in Java involves integrating with healthcare standards such as HL7 (Health Level Seven) for data exchange and implementing features such as patient registration, appointment scheduling, and electronic health record (EHR) management.

50. Energy Saving System

An Energy Saving System is a software application used to monitor, analyze, and optimize energy usage in buildings, facilities, or industrial processes. This system helps identify energy inefficiencies, track energy consumption patterns, and implement strategies to reduce energy consumption and costs. Building an Energy Saving System in Java involves integrating with sensors, meters, and building management systems to collect energy data, performing data analysis to identify energy-saving opportunities, and implementing control algorithms to optimize energy usage in real-time.

Engaging in Java projects with source code is an invaluable aspect of learning and mastering the language. Whether you're a novice aiming to solidify your foundation or an experienced developer seeking to enhance your skills, embarking on practical projects offers a rewarding learning experience. By exploring projects across different levels of complexity, developers can broaden their understanding, tackle challenges, and unleash their creativity in the world of Java programming.

Q1. Where can I find Java projects with source code for beginners?

Beginners can find Java projects on platforms like GitHub, CodeProject, and tutorial websites catering specifically to novice programmers.

Q2. How do Java projects help in learning programming?

Java projects provide hands-on experience, reinforce theoretical concepts, and promote problem-solving skills crucial for mastering programming.

Q3. Are Java projects suitable for advanced developers?

Yes, advanced developers can benefit from Java projects by tackling complex problems, exploring new technologies, and contributing to open-source projects.

Q4. Can I modify existing Java projects to suit my requirements?

Absolutely! Modifying existing Java projects allows developers to customize functionality, experiment with different approaches, and enhance their coding skills.

Q5. Are there online communities for discussing Java projects and seeking help?

Yes, numerous online forums and programming communities exist where developers can share ideas, seek assistance, and collaborate on Java projects.

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Java Programming Case Study Examples

• in Talent Insight

If you are an HR professional looking for talented Java programmers, then you are in the right place. This article will provide you with some great case study examples that showcase the skills and expertise of top Java programmers.

Importance of Case Studies for HR Professionals

Case studies are an essential tool for HR professionals when hiring top talent. They provide a deeper understanding of a candidate’s skills, knowledge, and experience, which is not always possible through resumes or interviews. By reviewing case studies, HR professionals can evaluate a candidate’s ability to solve complex problems and develop innovative solutions.

Here are some excellent case study examples that demonstrate the skills and expertise of top Java programmers:

• Google Maps : Google Maps is one of the most popular navigation applications in the world. It is built using Java and provides real-time traffic updates, street views, and satellite imagery. Google Maps is an excellent example of how Java programming can be used to develop complex and innovative solutions.
• Amazon : Amazon is the world’s largest online retailer, and its website is built using Java. The website handles millions of transactions every day, and its success is a testament to the reliability and scalability of Java programming.
• Netflix : Netflix is a streaming platform that delivers movies and TV shows to millions of users worldwide. It uses Java programming to create personalized recommendations, manage user profiles, and optimize streaming quality.

Why Choose Algobash?

At Algobash, we specialize in connecting HR professionals with top Java programmers. Our platform features a comprehensive database of talented programmers who have been rigorously tested and vetted. By using Algobash, you can save time and money while finding the perfect candidate for your organization.

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Best assessment types for effective employee selection, trends and innovations in the world of employee assessment.

• Software Developers
• Java Developers

Java Development Case Studies And Success Stories

by Ideamotive Talent

Take a look at these Java case studies to see how our developers have served clients in numerous industries. With each project analysis, you’ll be able to shape a general impression about our developers, their experience, and their skills. Every time we’re making our best effort to enhance the clients’ business and strengthen their positions on the market.

Here, you’ll discover about:

• Client’s business, the targets, and challenges they faced during the project’s implementation.
• What results they expect from our company and why they’ve chosen us.
• Our detailed step-by-step project analysis, specific methods, technologies, and tools we’ve used to succeed.
• The major challenges our team has faced, and the solution we’ve chosen to resolve the client’s problem.
• The final results our team has presented to the clients - what has been changed and the benefits our clients get with the outcome.

Napoli Gang: reinventing food delivery for a European delivery-based restaurant chain

How we developed a fast, scalable mobile solution from scratch for an estimated target audience of 10,000 users.

Napoli Gang

Food Service

JRPass: Marrying web development and business processes support

How to optimize booking system for a Japanese railway network and increase sales?

TRAVELDUCK: building a marketplace for boutique adventure trips and activities

How we created a fully functional digital marketplace from scratch and helped the Client validate the business model for scaling up.

Travel, Marketplace

There are hundreds of battle-proven experts in our Talent Network.

What our Clients say about us:

We’ve been extremely satisfied. We work with multiple partners, but they’re our main supplier because of the quality of their work.

Håkon Årøen

Co-founder & CTO of Memcare

Ideamotive has a huge pool of talent. Don’t just settle for someone: find a person who understands your project and has the competencies you need.

Julian Peterson

President, Luminate Enterprises

They understand and navigate the industry to deliver an outcome that will truly stand out. Despite a heavily saturated market, they’ve delivered creative solutions that I haven’t seen before.

Adam Casole-Buchanan

President, Rierra INC

They are very flexible, providing a team of developers on short notice and scaling the size as needed. Their team meets tight deadlines, including some that only give them a few hours to do the work.

Sylvain Bernard

Event Manager, Swiss Federal Institute of Technology Lausanne

Startups , scale-ups and enterprises build their teams with Ideamotive

Other Java developers hiring and business resources:

Java Developers Interview Questions

Java Developer Job Description And Ad

Java Development Company

Java Freelancers

The Business Side of Java Development [Guide]

Business registry data:

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Most desired experts

Rated 4.9 / 5.0 by 25 clients for web development, mobile development and design services.

Top 15 Java Projects With Source Code [2023]

Introduction, why these projects, java projects for beginners, 1. password generator using java, 2. online survey system, 3. online resume builder, 4. snake game using java, intermediate java projects with source code, 5. data visualization software, 6. electricity billing system, 7. web medical management system, 8. supply chain management system, 9. exam seating arrangement system in java, 10. wordcount tools in java, core java projects with source code, 11. create a consumer relationship management system, 12. bfit cognitive and memory testing game, 13. network packet sniffer analyzer software, 14. internet service provider automation system, 15. create a criminal face detection system, 1. what kind of projects is java used for, 2. where can i get java projects, 3. is java worth learning in 2023, additional resources.

“Our world, moved by Java”, Take a moment to contemplate this phrase. Java is one of the most commonly used programming languages. It is also used as the server-side language for most of the back-end development tasks, like those concerning Android development and Big Data. Java is also used for desktop computing, other mobile computing, games, and numerical computing. The popularity of Java is further evidenced by 90 per cent of all Fortune 500 companies using Java. In this article, we’ll be looking at 15+ exciting Java project ideas/topics for you to explore and practice.

Any layman can be a good developer, no matter if you possess a certain gene code to accomplish this or not. That being said, putting in the effort and harbouring the correct mindset is inevitable to accomplish this. Creating Java projects will assist you to hone your skills on real-life projects and amplify your spirit as a developer. This is the sole way to know if you own a pragmatic grasp of the theory you’ve learned. Functioning on these Java projects will let you equip yourself for a job.

The theoretical knowledge that you have is not of utmost importance, employers are interested in how you are able to translate the knowledge in a practical setup. You should create a portfolio of the tasks you have accomplished so far. So, when you interview for the role of developer, you will have solutions, code, apps, and projects, to exhibit to the recruiters. The portfolio will emphasize your strong points and recognize flaws that need modification.

Confused about your next job?

Reasons why software companies choose Java for developing enterprise applications:

• The software industry adopted Java as it made development a pleasure, resolved problems with distribution, and lessened the pang of continuously porting across platforms.
• As Java is an object-oriented language, it is huge and secure. Java programs are composed independently of the platform in bytecode language, which lets the same program work on any machine that is equipped with JVM. It is a realistic and practical approach to software design. Java objects envelop data and behaviour so that code can be used again, thereby making the process of testing and troubleshooting easier.
• Java’s popularity grew when people learned how Java could solve their hardships on servers – making productivity, execution, and scalability reach new levels.
• Java has demonstrated its supremacy over other languages from server-side scaling of multi-tier architecture to internet distribution of software, to the cloud-native deployments, to taking benefit of continuously upgrading hardware architectures and a whole lot more.

Here’s a list of ideas for beginners to try with Java

With the growing trend of hacking attacks, everyone should create different and complex passwords for their diverse accounts to keep them secure. Remembering every password is not humanly possible and noting it down somewhere is not a wise idea. Hence, people take the help of Password generators to create strong and complex passwords for their accounts. To generate such functionality all by yourself, you can take advantage of the function that java offers. Whenever a user is developing an account on a new website, you can use that program to develop a password. To take the safety of the password a notch above, you can enforce such functionality so that it saves passwords in encrypted form. To incorporate this, you need to study the fundamentals of Cryptography and Java Cryptography Architecture.

The idea of this project is to create a core java project that can accumulate the viewpoint of a targeted audience of a survey through the Internet. Based on that, the app can send the targeted audiences promotional emails and can launch online surveys. Any business can make use of this type of software to assemble feedback regarding the services or products they offer. We can build such functionality so that only registered customers can cast their responses. The main attributes of the app should be:

• The apps are programmed in a way that they should be compatible with various databases like SQL and NoSQL.
• Customers can submit their reactions anonymously.
• Should be installed at a doable cost.

People find it challenging to build their resumes. The concept of this java project is to make this process smooth for the customer. The project streamlines the job of designing a resume for an individual.

We can choose a few industry-accepted, well-crafted resume templates, and request the user to incorporate the details he/she wants to add to the resume. After imputing all the necessary information, a personalized resume can be rendered in pdf and doc format by selecting a single button. The app should own the following features:

• Engaging resume template.
• Update each piece of information as per the user’s needs.
• It should have the functionality to publish the resume instantly.

In our childhood, nearly all of us enjoyed playing classic snake games. Now we will try to enhance it with the help of Java concepts. The concept appears to be easy but it is not that effortless to implement.

One ought to comprehend the OOPs concept in detail to execute this effectively. Furthermore, ideas from Java Swing are used to create this application. The application should comprise the following functionalities:

• The Snake will have the ability to move in all four directions.
• The snake’s length grows as it eats food.
• When the snake crosses itself or strikes the perimeter of the box, the game is marked over.
• Food is always given at different positions.

Data visualization is a key part of the state-of-the-art business led by Data Science, Business Analytics, and Business Intelligence. It indicates the visual depiction of data in a pictorial arrangement. This is a powerful java project for apprentices. This information representation project is tied in with providing a synopsis of the plan and usage guidelines in information perception. The destinations of this task are to give clear and compelling correspondence of the experiences wrapped up in the information via appropriate graphical or pictorial depictions.

It depicts the hub availability in systems administration as information visualization. You can use a mouse or a trackpad to find it in different areas. The most useful part about the task is that you can enhance and modify the product highlights and capacities as demonstrated by your prerequisites.

This java project is a contemporary take on the classic electricity billing system where a person gathers data from our electricity meter. The primary objective of this project is to automate the entire process to make it seamless, convenient, and effective. The software can compute the bill amount on the basis of units of electricity consumed in a month. Electricity Billing System is considered one of the best java project ideas for beginners. The app should have the below-mentioned features:

• Accurately calculate the bill amount.
• Instantaneous sharing of data between local electricity offices and users.
• Extremely safe to negate the chances of tampering.

The undertaking is called a “Virtual Medicine Home.” By using this application, patients can reserve online meetings with their preferred specialists. Specialists can recommend medical services, e-remedy, and consider the patient’s clinical records, lab reports, and many more. The app also lets users explore and interface with individuals who are donating their organs or blood. During the times of the pandemic, when it gets dangerous to visit the hospital, this JAVA project comes to your rescue. The application comes with two modules — an Admin and a Doctor module. The Admin module is responsible for the online programming framework, and the Doctor module allows specialists to communicate with patients.

This venture implies smoothening the inventory network cycle by religiously keeping the sellers and customers in check and always following the items via the different focuses in the inventory network. By using this application, the clients can directly pass on their item prerequisites to the maker, who at that moment reaches various merchants to obtain the basic assets for making the item. Per the items given to them, the vendors as a rule make a rundown of things, post which the maker selects the materials that best serve the particulars provided by the client. The selected rundown of items is sent to the stock division for handling, and then the assembling starts. When the creation is completed, the records office establishes the crude materials’ expenses and the expense of gathering to generate the full bill. Lastly, the item with the receipt is sent to the customer.

This easy java project strives at building an automated seating arrangement of students for exams, on the basis of different inputs.

There are primarily two entities, the admin and the student. Both entities can log in and register to the system, and check and access the system as per the approval granted to them. The admin can see all the relevant details of the students and provide input to the system taking into consideration the need like the branch, semester, year, and subject of the student. Admin will input details like the total number of students, available classes with the number of seats, etc. After gathering all this information the system will generate a seating arrangement based on the row number and the students’ roll number.

This is another Java Project that is very helpful for engineering students to improve their learning in the File and String Handling concepts of Java. The programmer develops an interface on which customers can document their content and then obtain the total words in the content. The programmer strategies and saves the content in a file for the purpose of processing and then processes the content by String class to calculate the words. There are different choices that the programmer creates to make the project more creative and intriguing. You can also employ the Java APIs of formatting to format the content delivered by the client.

This evolved Java project needs refined mastery in Java database connectivity, MySQL, HTTP, and JSpring framework. You ought to learn Spring core/MVC, ORM framework, and Hibernate to accomplish this project. You will develop a management system for the web platform that will let community managers revise and access consumer data for more satisfactory consumer relations. This project utilizes the Spring framework and offers the source sets for Java programming.

If you wish to be an Android developer, incorporating Java Android development application projects into your resume is highly advantageous. This project is an online brain exercise game, which experiments with your memory and cognitive skills. To create this application, you will put up the user interface, implement game logic, make a splash screen, build a game guide, and arrange the game screens. You will also have to develop an APK for the app’s release. The last step includes an automatic data processing scoreboard in the app that keeps a track of the player’s answers.

If you are curious about the system and network administration profession, then this project might benefit you. The objectives of this project are to develop system security rules and put up network packet sniffer analyzer software for the purpose of system monitoring. You will construct a packet sniffer that comprises elements like 24/7 monitoring, solving network problems, packet decoding, protocol analysis, and storing real-time data. It comes with modules like statistics, packet analysis, and a user interface module.

This ISP (internet service provider) project needs you to build a system that delivers automated troubleshooting, and error messages to the consumer. The project also needs you to link the communication systems between the server and the ISP. It comprises four automation modules like the user login module, hardware and software modules, the service module, and a connection module. You will have to use Java technology, and J2EE to create this system.

If you are interested in face detection applications, then this project is meant for you. This project comprises eyewitness, investigator, and admin modules and needs you to create an effective image detection system. You will input sliced image data into the system and facilitate the instantaneous viewing feature on it.

To conclude, these are a few of the most-recommended Java projects that you can use to design as per your mastery and convenience. The projects will hone your programming skills and will prepare you for the tech industry by providing beneficial exposure. There are a bunch of other project ideas that one can incorporate with the help of Java. In this article, we have shed some light on the amazing Java project ideas for students who have started their journey with java as well as experts who are well versed with such projects. If you are an amateur, start with the fundamental projects, then slowly shift towards complex projects as you obtain knowledge in Java. Working on various projects is the best way to comprehend how things operate in real life, what hurdles that cross the path while creating an application, how to deal with those challenges, etc. Selecting a project that demonstrates the talents required for the specific job you are looking for will help you stand out to your potential employer.

Ans. Java is mainly utilized as the server-side language for back-end development projects, including big data and Android development.

Ans. One can download all the major java projects in Eclipse, Myeclipse, and Netbeans IDE’s.

Ans. Yes, as the world is racing towards mobile apps and convenience, Java has become more and more necessary as a language. It’s one of the strongest languages in today’s time.

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Java as a systems programming language: three case studies

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Java is the newest in a long line of systems programming languages. This paper looks at what makes it special and backs the findings up with three case studies. The projects exercise Java to the full — its features and APIs. The first is a Web Computing Skeleton for remote execution of collaborative programs. The second provides open query mechanisms to a spatial database. The third expands a distributed algorithm visualisation system. Issues of performance are discussed, as well as alternative ways of approaching the solutions. In general the results are positive and Java comes out as a worthy language for undertaking research in distributed systems.

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Bishop, J.M. (1998). Java as a systems programming language: three case studies. In: Horspool, R.N. (eds) Systems Implementation 2000. IFIP Advances in Information and Communication Technology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-35350-0_6

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Review these 50 questions to crack your Java programming interview

By javinpaul

A list of frequently asked Java questions from programming job interviews.

Hello, everybody! Over the past few years, I have been sharing a lot of Java Interview questions and discussion individually. Many of my readers have requested that I bring them together so that they can have them in the same spot. This post is the result of that.

This article contains more than 50 Java Interview questions covering all important topics like Core Java fundamentals, Java Collection Framework , Java Multithreading and Concurrency , Java IO , JDBC , JVM Internals , Coding Problems , Object-Oriented programming , etc.

The questions are also picked up from various interviews and they are, by no means, very difficult. You might have seen them already in your phone or face-to-face round of interviews.

The questions are also very useful to review important topics like multithreading and collections. I have also shared some useful resources for further learning and improvement like The Complete Java MasterClass to brush up and fill gaps in your Java skills.

So what are we waiting for? Here is the list of some of the most frequently asked Java questions in interviews for both beginner and experienced Java developers.

50+ Java Interview Questions for 2 to 3 years Experienced Programmers

So, without wasting any more of your time, here is my list of some of the frequently asked Core Java Interview Question s for beginner programmers. This list focuses on beginners and less experienced devs, like someone with 2 to 3 years of experience in Java.

1) How does Java achieve platform independence? ( answer ) hint: bytecode and Java Virtual Machine

2) What is ClassLoader in Java? ( answer ) hint: part of JVM that loads bytecodes for classes. You can write your own.

3) Write a Java program to check if a number is Even or Odd? ( answer ) hint: you can use bitwise operator, like bitwise AND, remember, even the number has zero at the end in binary format and an odd number has 1 in the end.

4) Difference between ArrayList and HashSet in Java? ( answer ) hint: all differences between List and Set are applicable here, e.g. ordering, duplicates, random search, etc. See Java Fundamentals: Collections by Richard Warburton to learn more about ArrayList, HashSet and other important Collections in Java.

5) What is double checked locking in Singleton? ( answer ) hint: two-time check whether instances is initialized or not, first without locking and second with locking.

6) How do you create thread-safe Singleton in Java? ( answer ) hint: many ways, like using Enum or by using double-checked locking pattern or using a nested static class.

7) When to use the volatile variable in Java? ( answer ) hint: when you need to instruct the JVM that a variable can be modified by multiple threads and give hint to JVM that does not cache its value.

8) When to use a transient variable in Java? ( answer ) hint: when you want to make a variable non-serializable in a class, which implements the Serializable interface. In other words, you can use it for a variable whose value you don’t want to save. See The Complete Java MasterClass to learn about transient variables in Java.

9) Difference between the transient and volatile variable in Java? ( answer ) hint: totally different, one used in the context of serialization while the other is used in concurrency.

10) Difference between Serializable and Externalizable in Java? ( answer ) hint: Externalizable gives you more control over the Serialization process.

11) Can we override the private method in Java? ( answer ) hint: No, because it’s not visible in the subclass, a primary requirement for overriding a method in Java.

12) Difference between Hashtable and HashMap in Java? ( answer ) hint: several but most important is Hashtable , which is synchronized, while HashMap is not. It's also legacy and slow as compared to HashMap .

13) Difference between List and Set in Java? ( answer ) hint: List is ordered and allows duplicate. Set is unordered and doesn't allow duplicate elements.

14) Difference between ArrayList and Vector in Java ( answer ) hint: Many, but most important is that ArrayList is non-synchronized and fast while Vector is synchronized and slow. It's also legacy class like Hashtable .

15) Difference between Hashtable and ConcurrentHashMap in Java? ( answer ) hint: more scalable. See Java Fundamentals: Collections by Richard Warburton to learn more.

16) How does ConcurrentHashMap achieve scalability? ( answer ) hint: by dividing the map into segments and only locking during the write operation.

17) Which two methods you will override for an Object to be used as Key in HashMap ? ( answer ) hint: equals and hashcode

18) Difference between wait and sleep in Java? ( answer ) hint: The wait() method releases the lock or monitor, while sleep doesn't.

19) Difference between notify and notifyAll in Java? ( answer ) hint: notify notifies one random thread is waiting for that lock while notifyAll inform to all threads waiting for a monitor. If you are certain that only one thread is waiting then use notify , or else notifyAll is better. See Threading Essentials Mini-Course by Java Champion Heinz Kabutz to learn more about threading basics.

20) Why you override hashcode, along with equals() in Java? ( answer ) hint: to be compliant with equals and hashcode contract, which is required if you are planning to store your object into collection classes, e.g. HashMap or ArrayList .

21) What is the load factor of HashMap means? ( answer ) hint: The threshold that triggers the re-sizing of HashMap is generally 0.75, which means HashMap resize itself if it's 75 percent full.

22) Difference between ArrayList and LinkedList in Java? ( answer ) hint: same as an array and linked list, one allows random search while other doesn't. Insertion and deletion easy on the linked list but a search is easy on an array. See Java Fundamentals: Collections , Richard Warburton’s course on Pluralsight, to learn more about essential Collection data structure in Java.

23) Difference between CountDownLatch and CyclicBarrier in Java? ( answer ) hint: You can reuse CyclicBarrier after the barrier is broken but you cannot reuse CountDownLatch after the count reaches to zero.

24) When do you use Runnable vs Thread in Java? ( answer ) hint: always

25) What is the meaning of Enum being type-safe in Java? ( answer ) hint: It means you cannot assign an instance of different Enum type to an Enum variable. e.g. if you have a variable like DayOfWeek day then you cannot assign it value from DayOfMonth enum.

26) How does Autoboxing of Integer work in Java? ( answer ) hint: By using the valueOf() method in Java.

27) Difference between PATH and Classpath in Java? ( answer ) hint: PATH is used by the operating system while Classpath is used by JVM to locate Java binary, e.g. JAR files or Class files. See Java Fundamentals: The Core Platform to learn more about PATH , Classpath , and other Java environment variable.

28) Difference between method overloading and overriding in Java? ( answer ) hint: Overriding happens at subclass while overloading happens in the same class. Also, overriding is a runtime activity while overloading is resolved at compile time.

29) How do you prevent a class from being sub-classed in Java? ( answer ) hint: just make its constructor private

30) How do you restrict your class from being used by your client? ( answer ) hint: make the constructor private or throw an exception from the constructor

31) Difference between StringBuilder and StringBuffer in Java? ( answer ) hint: StringBuilder is not synchronized while StringBuffer is synchronized.

32) Difference between Polymorphism and Inheritance in Java? ( answer ) hint: Inheritance allows code reuse and builds the relationship between class, which is required by Polymorphism, which provides dynamic behavior. See Java Fundamentals: Object-Oriented Design to learn more about OOP features.

33) Can we override static method in Java? ( answer ) hint: No, because overriding resolves at runtime while static method call is resolved at compile time.

34) Can we access the private method in Java? ( answer ) hint: yes, in the same class but not outside the class

35) Difference between interface and abstract class in Java? ( answer ) hint: from Java 8 , the difference is blurred. However, a Java class can still implement multiple interfaces but can only extend one class.

36) Difference between DOM and SAX parser in Java? ( answer ) hint: DOM loads whole XML File in memory while SAX doesn’t. It is an event-based parser and can be used to parse a large file, but DOM is fast and should be preferred for small files.

37) Difference between throw and throws keyword in Java? ( answer ) hint: throws declare what exception a method can throw in case of error but throw keyword actually throws an exception. See Java Fundamentals: Exception Handling to learn more about Exception handling in Java.

38) Difference between fail-safe and fail-fast iterators in Java? ( answer ) hint: fail-safe doesn’t throw ConcurrentModificationException while fail-fast does whenever they detect an outside change on the underlying collection while iterating over it.

39) Difference between Iterator and Enumeration in Java? ( answer ) hint: Iterator also gives you the ability to remove an element while iterating while Enumeration doesn’t allow that.

40) What is IdentityHashMap in Java? ( answer ) hint: A Map , which uses the == equality operator to check equality instead of the equals() method.

41) What is the String pool in Java? ( answer ) hint: A pool of String literals. Remember it's moved to heap from perm gen space in JDK 7.

42) Can a Serializable class contains a non-serializable field in Java? ( answer ) hint: Yes, but you need to make it either static or transient.

43) Difference between this and super in Java? ( answer ) hint: this refers to the current instance while super refers to an instance of the superclass.

44) Difference between Comparator and Comparable in Java? ( answer ) hint: Comparator defines custom ordering while Comparable defines the natural order of objects, e.g. the alphabetic order for String . See The Complete Java MasterClass to learn more about sorting in Java.

45) Difference between java.util.Date and java.sql.Date in Java? ( answer ) hint: former contains both date and time while later contains only date part.

46) Why wait and notify method are declared in Object class in Java? ( answer ) hint: because they require lock which is only available to an object.

47) Why Java doesn’t support multiple inheritances? ( answer ) hint: It doesn’t support because of a bad experience with C++, but with Java 8, it does in some sense — only multiple inheritances of Type are not supported in Java now.

48) Difference between checked and unchecked Exception in Java? ( answer ) hint: In case of checked, you must handle exception using catch block, while in case of unchecked, it’s up to you; compile will not bother you.

49) Difference between Error and Exception in Java? ( answer ) hint: I am tired of typing please check the answer

50) Difference between Race condition and Deadlock in Java? ( answer ) hint: both are errors that occur in a concurrent application, one occurs because of thread scheduling while others occur because of poor coding. See Multithreading and Parallel Computing in Java to learn more about deadlock, Race Conditions, and other multithreading issues.

Closing Notes

Thanks, You made it to the end of the article … Good luck with your programming interview! It’s certainly not going to be easy, but by following this roadmap and guide, you are one step closer to becoming a DevOps engineer .

If you like this article, then please share with your friends and colleagues, and don’t forget to follow javinpaul on Twitter!

Additional Resources

• Java Interview Guide: 200+ Interview Questions and Answers
• Spring Framework Interview Guide — 200+ Questions & Answers
• Preparing For a Job Interview By John Sonmez
• Java Programming Interview Exposed by Markham
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Java.io in nutshell: 22 case studies

This post attempts to cover a comprehensive set of operations in java.io . Compared with other books and blogs related to this topic, my motivation is to show “how-to” through case studies. As once a Java student, I realize the most effective way of learning a new program language is through examples: copy and paste a piece of codes, run it to see results, then try to modify and re-run it step-by-step. Therefore, I assume this post will be helpful.

It is worth noting that this post will not touch anything related to java.nio because I think it is quite a different topic.    

Table of Contents

Case 0: create a new file, case 1: two constants in file, case 2: delete a file, case 3: create a directory, case 4: list files and directories in a given directory, case 5: tests whether a file is a file, case 6: write to a randomaccessfile, case 7: write bytes to a file, case 8: append bytes to a file, case 9: read bytes from a file, case 10: copy files, case 11: write chars to a file, case 12: read chars from a file, case 13: convert from outputstream to filewriter, case 14: convert from inputstream to filereader, case 15: use pipeline, case 16: write formatted string to a file, case 17: redirect the “standard” io, case 18: read a file line by line, case 19: compress to a zip file, case 20: extract from a zip file, case 21: push back bytes.

Output: a new and empty file is created in the working directory, iff there is no “helloword.txt” before.

I get the above output because I am working on Linux. If you use Windows, the output should be \ and ; . As can be seen, for the purpose of portability and robustness, it should always be recommended to use these two constants.

Output: I am using Eclipse

File . list() returns an array of strings. If you prefer an array of File s, please use File . listFiles() :

Combined with File . listFiles() , we can list all files in the given directory and its sub-directories.

Output: compared with Case 4 to see the difference

If you open the file using text editor, you will find garbled code except the first hello world!A (kindly note the char A at the end of “hello world!”). This is because RandomAccessFile only writes an array of bytes in the file.

This time you can see “hello world!” in the file. Of course you can write to an OutputStream byte by byte, but it is less effective:

Output: hello world!hello world!

The InputStream . read() will return -1 if it reaches the end of the file. Otherwise, it will return the total number of bytes read into the buffer.

Simply combine Case 7 and 9 , we will get the copy function.

For the above case, you will get the same result as in Case 7 . So what is the difference? FileWriter is meant for writing streams of characters. It will use the default character encoding and the default byte-buffer size. In other words, it is a wrapper class of FileOutputStream for convenience. Therefore, to specify these values yourself, consider using a FileOutputStream .

Whether to use streams of bytes or characters? It really depends. Both have buffers. InputStream/OutputStream provide more flexibility, but will make your “simple” program complex. On the other hand, FileWriter/FileReader give a neat solution but you lose the control.

Instead of using default character encoding, you can specify the charset. For example,

The following code creates two thread, a Producer which writes something into the pipeline at one end and a Consumer which reads it from the pipeline at the other end. To create a pipeline, we need to create PipedInputStream and PipedOutputStream seperately, and connect them using output.connect(input) or via their constructors. In this program, I intentionally start the Consumer thread first and ask the whole program to sleep 1 second before starting the Producer thread. This will show the pipeline DOES work. It is worthy noting that, I close the pipeline in the Producer because “ A thread that writes to a stream should always close the OutputStream before terminating. ” If we remove the out.close() line, an IOException will be thrown

PrintStream adds functionality to print representations of various data values conveniently. The format string syntax is almost same as C.

In Java, both standard and error output are PrintStream s. The standard input is InputStream . Therefore we can reassign them freely. The following code redirect the standard output to error output.

Output: In Eclipse, red text means error message

The above code creates a zip file and puts three files, named “helloworld0.txt”, “helloworld1.txt”, and “helloworld2.txt”, each of which contains the content “hello world!”.

The above code pushes a dot after reading a comma, therefore the output is

However, if you try to push more characters back such as push.unread("(...)".getBytes()); , you will get an IOException : Push back buffer is full. This is because the default size of the pushback buffer is 1. To specify it with larger capacity, use the constructor PushbackInputStream(InputStream in, int size) , such as

We will contact you soon.

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I’m afraid to say that the guava library (especially com.google.common.io.Files) makes many of these redundant…

true. this post is mostly for beginners.

Nice collection of cases. But may I suggest to improve the examples to not lure beginners into thinking that a conversion between bytes and String is ok without excplicit encoding? This applies to String.getBytes(), as well as for all the constructors of Reader or Writer you use. Just yesterday we had to waste three hours for an encoding bug hunt where a Reader was opened without explicit encoding. It worked on Linux but not on Windows, because the default encoding is different. One further comment regarding IOExceptions. You define your main() methods as throwing an IOException. This gets you around …  Read more »

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Java Examples

The best way to learn Java programming is by practicing examples. The page contains examples on basic concepts of Java. You are advised to take the references from these examples and try them on your own.

All the programs on this page are tested and should work on all platforms.

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• Java Program to Check Prime Number
• Java Program to Display Fibonacci Series
• Java Program to Create Pyramids and Patterns
• Java Program to Reverse a Number
• Java Program to Print an Integer (Entered by the User)
• Java Program to Add Two Integers
• Java Program to Multiply two Floating Point Numbers
• Java Program to Find ASCII Value of a character
• Java Program to Compute Quotient and Remainder
• Java Program to Swap Two Numbers
• Java Program to Check Whether a Number is Even or Odd
• Java Program to Check Whether an Alphabet is Vowel or Consonant
• Java Program to Find the Largest Among Three Numbers
• Java Program to Find all Roots of a Quadratic Equation
• Java Program to Check Leap Year
• Java Program to Check Whether a Number is Positive or Negative
• Java Program to Check Whether a Character is Alphabet or Not
• Java Program to Calculate the Sum of Natural Numbers
• Java Program to Find Factorial of a Number
• Java Program to Generate Multiplication Table
• Java Program to Find GCD of two Numbers
• Java Program to Find LCM of two Numbers
• Java Program to Display Alphabets (A to Z) using loop
• Java Program to Count Number of Digits in an Integer
• Java Program to Calculate the Power of a Number
• Java Program to Check Palindrome
• Java Program to Check Whether a Number is Prime or Not
• Java Program to Display Prime Numbers Between Two Intervals
• Java Program to Check Armstrong Number
• Java Program to Display Armstrong Number Between Two Intervals
• Java Program to Display Prime Numbers Between Intervals Using Function
• Java Program to Display Armstrong Numbers Between Intervals Using Function
• Java Program to Display Factors of a Number
• Java Program to Make a Simple Calculator Using switch...case
• Java Program to Check Whether a Number can be Expressed as Sum of Two Prime Numbers
• Java Program to Find the Sum of Natural Numbers using Recursion
• Java Program to Find Factorial of a Number Using Recursion
• Java Program to Find G.C.D Using Recursion
• Java Program to Convert Binary Number to Decimal and vice-versa
• Java Program to Convert Octal Number to Decimal and vice-versa
• Java Program to Convert Binary Number to Octal and vice-versa
• Java Program to Reverse a Sentence Using Recursion
• Java Program to calculate the power using recursion
• Java Program to Calculate Average Using Arrays
• Java Program to Find Largest Element of an Array
• Java Program to Calculate Standard Deviation
• Java Program to Add Two Matrix Using Multi-dimensional Arrays
• Java Program to Multiply Two Matrix Using Multi-dimensional Arrays
• Java Program to Multiply two Matrices by Passing Matrix to a Function
• Java Program to Find Transpose of a Matrix
• Java Program to Find the Frequency of Character in a String
• Java Program to Count the Number of Vowels and Consonants in a Sentence
• Java Program to Sort Elements in Lexicographical Order (Dictionary Order)
• Java Program to Add Two Complex Numbers by Passing Class to a Function
• Java Program to Calculate Difference Between Two Time Periods
• Java Code To Create Pyramid and Pattern
• Java Program to Remove All Whitespaces from a String
• Java Program to Print an Array
• Java Program to Convert String to Date
• Java Program to Round a Number to n Decimal Places
• Java Program to Concatenate Two Arrays
• Java Program to Convert Character to String and Vice-Versa
• Java Program to Check if An Array Contains a Given Value
• Java Program to Check if a String is Empty or Null
• Java Program to Get Current Date/Time
• Java Program to Convert Milliseconds to Minutes and Seconds
• Java Program to Add Two Dates
• Java Program to Join Two Lists
• Java Program to Convert a List to Array and Vice Versa
• Java Program to Get Current Working Directory
• Java Program to Convert Map (HashMap) to List
• Java Program to Convert Array to Set (HashSet) and Vice-Versa
• Java Program to Convert Byte Array to Hexadecimal
• Java Program to Create String from Contents of a File
• Java Program to Append Text to an Existing File
• Java Program to Convert a Stack Trace to a String
• Java Program to Convert File to byte array and Vice-Versa
• Java Program to Convert InputStream to String
• Java Program to Convert OutputStream to String
• Java Program to Lookup enum by String value
• Java Program to Compare Strings
• Java Program to Sort a Map By Values
• Java Program to Sort ArrayList of Custom Objects By Property
• Java Program to Check if a String is Numeric
• Java Program to convert char type variables to int
• Java Program to convert int type variables to char
• Java Program to convert long type variables into int
• Java Program to convert int type variables to long
• Java Program to convert boolean variables into string
• Java Program to convert string type variables into boolean
• Java Program to convert string type variables into int
• Java Program to convert int type variables to String
• Java Program to convert int type variables to double
• Java Program to convert double type variables to int
• Java Program to convert string variables to double
• Java Program to convert double type variables to string
• Java Program to convert primitive types to objects and vice versa
• Java Program to Implement Bubble Sort algorithm
• Java Program to Implement Quick Sort Algorithm
• Java Program to Implement Merge Sort Algorithm
• Java Program to Implement Binary Search Algorithm
• Java Program to Call One Constructor from another
• Java Program to implement private constructors
• Java Program to pass lambda expression as a method argument
• Java Program to Pass the Result of One Method Call to Another Method
• Java Program to Calculate the Execution Time of Methods
• Java Program to Convert a String into the InputStream
• Java Program to Convert the InputStream into Byte Array
• Java Program to Load File as InputStream
• Java Program to Create File and Write to the File
• Java Program to Read the Content of a File Line by Line
• Java Program to Delete File in Java
• Java Program to Delete Empty and Non-empty Directory
• Java Program to Get the File Extension
• Java Program to Get the name of the file from the absolute path
• Java Program to Get the relative path from two absolute paths
• Java Program to Count number of lines present in the file
• Java Program to Determine the class of an object
• Java Program to Create an enum class
• Java Program to Print object of a class
• Java Program to Create custom exception
• Java Program to Create an Immutable Class
• Java Program to Check if two strings are anagram
• Java Program to Compute all the permutations of the string
• Java Program to Create random strings
• Java Program to Clear the StringBuffer
• Java Program to Capitalize the first character of each word in a String
• Java Program to Iterate through each characters of the string.
• Java Program to Differentiate String == operator and equals() method
• Java Program to Implement switch statement on strings
• Java Program to Calculate simple interest and compound interest
• Java Program to Implement multiple inheritance
• Java Program to Determine the name and version of the operating system
• Java Program to Check if two of three boolean variables are true
• Java Program to Iterate over enum
• Java Program to Check the birthday and print Happy Birthday message
• Java Program to Implement LinkedList
• Java Program to Implement stack data structure
• Java Program to Implement the queue data structure
• Java Program to Get the middle element of LinkedList in a single iteration
• Java Program to Convert the LinkedList into an Array and vice versa
• Java Program to Convert the ArrayList into a string and vice versa
• Java Program to Iterate over an ArrayList
• Java Program to Iterate over a HashMap
• Java Program to Iterate over a Set
• Java Program to Merge two lists
• Java Program to Update value of HashMap using key
• Java Program to Remove duplicate elements from ArrayList
• Java Program to Get key from HashMap using the value
• Java Program to Detect loop in a LinkedList
• Java Program to Calculate union of two sets
• Java Program to Calculate the intersection of two sets
• Java Program to Calculate the difference between two sets
• Java Program to Check if a set is the subset of another set
• Java Program to Sort map by keys
• Java Program to Pass ArrayList as the function argument
• Java Program to Iterate over ArrayList using Lambda Expression
• Java Program to Implement Binary Tree Data Structure
• Java Program to Perform the preorder tree traversal
• Java Program to Perform the postorder tree traversal
• Java Program to Perform the inorder tree traversal
• Java Program to Count number of leaf nodes in a tree
• Java Program to Check if a string contains a substring
• Java Program to Access private members of a class
• Java Program to Check if a string is a valid shuffle of two distinct strings
• Java Program to Implement the graph data structure
• Java Program to Remove elements from the LinkedList.
• Java Program to Add elements to a LinkedList
• Java Program to Access elements from a LinkedList.

Core Java Tutorial

Online Core Java Tutorial for beginners to learn the basic concepts of Core Java. Here you will learn the fundamentals of Core Java (Class, Interface, etc.). These sections also contain a cheat sheet for a quick preview of what you have learned on a given topic.

Getting Started

• History of Java
• Getting Started with Java
• JDK vs JRE vs JVM
• public static void main(string args)
• Class & Object
• Constructor in Java
• Hello JBT in Eclipse (R)
• Order of Execution of block
• Access Modifier
• Non-Access Modifier
• Data Types in Java (R)
• Arithmetic Operator in Java
• Java Statement
• Different ways to create Object
• Equal method vs == operator
• Inner Class
• String Builder (R)
• Method Parameter & argument
• Switch case
• Java Variables
• Local Variable
• Instance Variable
• Reference Variable (R)
• Variable Shadowing
• Relational Operator
• Boolean Operator
• Equal Operator (Video)
• Java For Loop 
• While Loop (Youtube)
• Java enhanced for loop (Youtube)
• Common Looping Algorithm (Youtube)
• Common Looping Algorithm – Count Match (Youtube)
• Common Looping Algorithm – Find First Match (Youtube)
• Try with a resource statement
• try catch finally block

OOPS Concept

• Overloading
• Inheritance (Youtube)
• Encapsulation (Youtube)
• Abstraction (Youtube)
• Composition (Youtube)
• Composition – Cont. (Youtube)
• this keyword
• Static keyword
• Java HashMap

Serialization

• Transient vs Static
• Use of serialVersionUID
• Enum Example

Java 8 Stream

• Functional Interface
• Introduction to Lambda (R)
• foreach List
• foreach Map
• pattern matching instanceof

Advanced Topics

• Java Classloader
• How JVM Works

We have created a new Section of Selenium Tutorial .

200 Comments → Core Java Tutorial

import java.util.Scanner;

class Rextester { public static void main(String args[]) { int n1 = 0, n2 = 1, n3, i, count = 0; Scanner sc = new Scanner(System.in); System.out.println(“Enter count : “); count = sc.nextInt(); System.out.println(“Fibonacci Series up to ” + count + ” : “); System.out.print(n1 + ” ” + n2);//printing 0 and 1 //loop starts from 2 because 0 and 1 are already printed for (i = 2; i < count; ++i) { n3 = n1 + n2; System.out.print(" " + n3); n1 = n2; n2 = n3; } } }

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Thank you for your nice comment. You asked why there is topics about job in java section. Could you please let me know what section u are talking about.

Regards Admin

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How to make rectangle ,cirlcle on core jav

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sorry java switch statement

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Hi Praveen,

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i ask a question , is that difference between java & core java?please clear my doubt

Java is a language which are divided in 3 different modules for 3 different purpose. J2SE (Core functionality), J2EE(used for Web Application) & J2ME(Used for Mobile platform development). In normal terms J2SE is known as Core java while J2EE is known as Advance Java.

Hello, do you have a tutorial on J2EE? Please reply. Thanks!

Currently we don’t have any J2EE Specifc course. But we do have a JSP section where we have article based on JSP.

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java Head First Book

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Thanks&Regards Ramjeet maurya

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Regards Praveen

You can buy eBook from Top Menu link

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You can refer this article for better understanding. http://94.143.139.145/core-java-tutorial/java-equals-method-vs-operator/

“Equals” is used to compared string type And “==” is used for comparing integer type

This is not true.

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Hi Prabhakar,

You are already on a page where you will get link to all article which will be required by you to learn Core Java. Have you visited them? And what exactly do you want? Also PDF file is already available which you can buy by paying 100 rs.

What else you are looking for do let me know. I ll see if i can help you in that regard.

Hi Vivekanand,

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This provides easy learning

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Started learning java..hopefully can get better documents

I hope you get a better document too. Best of luck

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Plz check your mail.

i only want to test

thanks for this tutorial, Please upload some JSP interview questions

Basic core java laering

Hi core java learned my college life. now am moving advance java. its how many module there? it is also based on the corejava concept?

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Hi Gautham Sir,

Can you teach me core java on online? if so whats the charges ? I really want to take classes from you.

Please email me asap with positive response.

Hi Gautham,

Thanks for the quick reply… 🙂 I am using Eclipse IDE for doing Java programs i know the core java concepts but progrmaming making me difficult… Not able to get confidence on especially Programming…

and please tell me clear details about your paid service.. like what and all topics you cover?? Fees??

Thanks, Chandra

Thanks for very quick reply… Ya i am already using Eclipse IDE and doing small programs, But still feeling difficulty in writing big programs… please help me out… and about your paid service, please tell me the clear details like what and all contents you will cover,fee details, etc

Thanks for such a nice tutorial… 🙂 I am learning java and know core java concepts, but when it comes to write some programs, i am feeling difficulty… Please let me know the best way to feel it easy and become expert…

Thanks in Advance

Regards, Chandu

Hi Chandra,

Thanks for your nice comment. If you know the basics then you should not have any problem with writting code. If you want to start coding then you should start with very basics ofcore java like prinitng any value on console. I would suggest you to download Eclipse IDE first.

I have written different article on how to create Java Project in Eclipse. Once created you can start creating Classes and start playing with same. You can have different assignment available which you can try to solve on your own. Keep in mind that there is no hard and fast rule to learn Java. Only practice can make you perfect. While writting code you have specific question you can ask me personally.

I have a paid service where i use to check the assignment and help learner write code. If you are willing to pay for this let me know.

Useful information.

you guys suck she is teaching instalation

i need core java and j2EE full tutorial materials. can you send my email? PLEASE friends help me…..

Excellent work done .Really helpful for freshers and some times for experienced people too. great job and keep it up.

If possible provide some sample codes to practice with solutions.

Thanks for your nice word. I would love to add more content if time permit. I will take your suggestion and try to add more example.

Hi,, I am new in coding and i want to learn Core Java & C please help me out.

Thanks Admin

Please do reply.

As you can see i have different topics for different section in Java. You can start learning Java by following Java article sequentially. I do not have any idea of C++ language. So i would not be able to help you in this regard.

I would suggest you to first buy a good book for the same. Or if you want more clarity then you can refer original document of Java.

Great description of topics…I have read many topics here all are very good….For knowing internal mechanism of java methods, class and objects please visit java by vikas

Thank u Gautam, Surely i ll let you know abt my progress… I have not yet started.. Once i start, i ll intimate you…

Hi Gautam, Even i was in need of one project for my practice. I will try to implement for ur requirements. If done, i ll let you know… Hope i may take bit long time as this is my first project for which i am working for and i am sure i ll learn more if i implement it.

Thank you….

Best of luck for this project. I would love to know the progress of this project development. If you can successfully implement this do let me know so that i can add the same on website. So that others can take the help of it. You can also write an article for the same.

hello sir.. i have to make a project on core java..would u plz suggest me some topics

I don’t know what is the purpose of creating this project. But i have one project in my mind because of requirement. So i ll tell you. Try to build it and if successful let me know i might use it.

We have team of developer where Team Lead assign a work to every one on everyday or weekly basis. and every one in the team has to report to team leader. And leader will analyses in the end what different resources has done in last week or month and generate the report accordingly which will be used in Audit purpose.

So you will have a web application. It will have two User roles. 1- Team Lead 2- Developer

Roles of Developer 1- Can view the assigned work by team lead. 2- Can update the work sheet 3- Can close the work assigned which in return go back to team lead pool

Roles assigned to TL role 1- Can create work 2- Can assign work created to different user(Developer) 3- Provide the deadline for different work. 4- Can generate the report of all work done by developer.

System functionality. 1- Once there is any work assigned to any developer mail should be delivered to developer. 2- When deadline is about to read notification should also reach. 3- Once developer mark and work as completed. Work should go into TL pool. 4- Report should be generate in the form of DOC/ Excel

It is the requirement below the technology stack that you can use 1- Spring 3.1 2- Hibernate (Data Persistence) 3- Spring Security (Role related assignment) 4- Apache POI (Report Generation)

I think now i have given you enough information. If you like you can create it. If successful let me know i will glad to add it in my website.

If you require any more input you can contact me.

Can u tell me.. What r all d questions n java that clasified n simple medium nd tuff 4 interview poit of view??

package ka use kis work ke liye kiya jata hai ?

Package is used for organizing classes. This is not something which is enforced by JVM or Java. But it is suggested to have classes defined in proper package coz in that case you can have unique namespace for different classes(even if class name is same.)

e.g. Suppose you and your colleague is working on different modules(Sales and HR ) of the same project and you both are unware of the class name created by other. In the end you might face a situation where both of you have created class with same name(Department). This will create problem. To avoid this problem you both can use package. You can create class in your specific package(com.sales & com.hr). In this way you will avoid conflict of class name. Coz even if class name is same namespace will be unique.

com.sales.department com.hr.department

hope now you understand the use of package.

Nice site for interview question thanks.

Please Share the interview Question for two years experience in java.

Please check our other website for Interview question. javainterview.co.in

can i get the full materials… pls pls help me..

Hi Sheetal,

I am sorry but i can not help you in this regard. This site is collection of my own experiences. I developed this site just for my reference. But eventually it became famous. I do not have any consolidated material.

You have to go through Article by Article only.

Hi, Sheetal,

You can download all the computer books in one side that is http://www.it-ebooks.info

Thanks Anup Kr.

This is one of the best tutorial website for java, J2EE technologies

i am newly learning java programming language. would any one please be ready to share resources and experiences with me? write me in my email: [email protected]

have you got it????

Can anyone please help me to become an hacker I am a beginner please help me….send in my email 📧

This is enough for Java, J2EE technologies

Looks good. A well-written one.

cool section! here’s some more:

1) Junior java developer a) Basic ocjp (former scjp) questions: – What does static, final mean, purposes; – How many accesibility modifiers exist? Please describe them. – Why do you need a main method? – How many constructors can you have? – Define overwriting and overloading – Give java API implementations for overwriting and overloading – Describe the String class – unique properties – StringBuilder vs StringBuffer – Collections : please describe, give some examples and compare them to eachother – ArrayList vs Vector – HashMap vs HashTable – What’s a tree – What’s a map – Multithreading: describe the management in java – What’s a semaphone? – How many states are there for threads? – Describe the usage for synchronized word (2) – Serialization in java – a descrition and usage – Garbage collection in java – description and usage – Can you guarantee the garbage collection process? b) Simple design pattern questions: – Singleton please describe main features and coding – Factory please describe main features and coding – Have you used others? please describe them

2) Intermediate and Senior level – depending on rate of good responses, additional questions to 1):

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• Java Course
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Java Programs – Java Programming Examples

Java is one of the most popular programming languages today because of its simplicity. Java programming concepts such as control statements, Arrays, Strings, Object-Oriented Programming (OOP) , etc. are very important from an interview perspective as well as from exams. 

So, whether you are a fresher preparing for job interviews or a beginner who has covered Java Fundamentals and wants to practice Java concepts then, this J ava Programming Examples page covers a wide range of Java programs in an organized manner.

In this article, we will learn and prepare for Interviews using Java Programming Examples . From basic Java programs like the Fibonacci series , Prime numbers , Factorial numbers , and Palindrome numbers to advanced Java programs.

So, keep scrolling or bookmark this page to learn about Java (Basic to Advanced) using Java Programming Examples.

Table of Content

Java Basic Programs

Java pattern programs, java conversion programs, java classes and object programs, java methods programs, java searching programs, java 1-d array programs, java 2-d arrays (matrix) programs, java string programs, java list programs, java date and time programs, java file programs, java directory programs, java exceptions and errors programs, java collections programs, java multithreading programs, java more java programs.

This section, “Java Basic Programs,” provides a launchpad if you are new to Java programming . Here, you’ll encounter a collection of fundamental Java programs, that is crafted to introduce you to the core syntax, data structures, and control flow mechanisms of Java development.

• Java Program to Read The Number From Standard Input
• Java Program to Get Input from the User
• Java Program to Multiply Two Floating-Point Numbers
• Java Program to Swap Two Numbers
• Java Program to Add Two Binary Strings
• Java Program to Add Two Complex Numbers
• Java Program to Check Even or Odd Integers
• Java Program to Find Largest Among 3 Numbers
• Java Program to Find LCM of 2 numbers
• Java Program to Find GCD or HCF of 2 numbers
• Java Program to Display All Prime Numbers from 1 to N
• Java Program to Check Leap Year
• Java Program to Check Armstrong Number between Two Integers
• Java Program to Check whether the input number is a Neon Number
• Java Program to Check whether input character is vowel or consonant
• Java Program to Find Factorial of a number
• Java Program to Find Even Sum of Fibonacci Series Till number N
• Java Program to Calculate Simple Interest
• Java Program to Calculate Compound Interest
• Java Program to Find the Perimeter of a Rectangle

In this section, you will get a list of Java programming language that deals with patterns. By meticulously arranging stars, numbers, or characters, you’ll not only solidify your grasp of Java loops and control structures but also discover the aesthetic side of programming.

• Java Program to Print Right Triangle Star Pattern
• Java Program to Print Left Triangle Star Pattern
• Java Program to Print Pyramid Star Pattern
• Java Program to Print Reverse Pyramid Star Pattern
• Java Program to Print Upper Star Triangle Pattern
• Java Program to Print Mirror Upper Star Triangle Pattern
• Java Program to Print Downward Triangle Star Pattern
• Java Program to Print Mirror Lower Star Triangle Pattern
• Java Program to Print Star Pascal’s Triangle
• Java Program to Print Diamond Star Pattern
• Java Program to Print Square Star Pattern
• Java Program to Print Spiral Pattern of Numbers

Java Conversion Programs put your coding skills to the test. Here, you’ll encounter a series of exercises designed to strengthen your ability to transform data, like converting Binary to Decimal and more.

• Java Program For Binary to Octal Conversion
• Java Program For Octal to Decimal Conversion
• Java Program For Decimal to Octal Conversion
• Java Program For Hexadecimal to Decimal Conversion
• Java Program For Decimal to Hexadecimal Conversion
• Java Program For Decimal to Binary Conversion
• Java Program For Binary to Decimal Conversion
• Java Program For Boolean to String Conversion
• Java Program For String to Double Conversion
• Java Program For Double to String Conversion
• Java Program For String to Long Conversion
• Java Program For Long to String Conversion
• Java Program For Int to Char Conversion
• Java Program For Char to Int Conversion

Here in this section, you will dive into the world of classes, acting as blueprints for objects, and objects themselves, the real-life entities.

• Java Program to Create a Class and Object
• Java Program to Create Abstract Class
• Java Program to Create Singleton Class
• Java Program to Create an Interface
• Java Program to Show Encapsulation in Class
• Java Program to Show Inheritance in Class
• Java Program to Show Abstraction in Class
• Java Program to Show Data Hiding in Class
• Java Program to Show Polymorphism in Class
• Java Program to Show Overloading of Methods in Class
• Java Program to Show Overriding of Methods in Classes
• Java Program to Show Use of Super Keyword in Class
• Java Program to Show Use of This Keyword in Class
• Java Program to Show Usage of Static keyword in Class
• Java Program to Show Usage of Access Modifier

This section unlocks the secrets of methods, the building blocks of reusability in object-oriented programming. Here, you’ll embark on a hands-on journey, crafting and wielding methods like a programming pro.

• Java Program to Show Usage of Main() method
• Java Program to Show Use of Static and Non-static Methods
• Java Program to Show Usage of forEach() Method
• Java Program to Show Usage of toString() Method
• Java Program to Show Usage of codePointAt() Method
• Java Program to Show Usage of compare() Method
• Java Program to Show Usage of equals() Method
• Java Program to Show Usage of hasNext() and next() Method
• start() Method
• run() Method

Looking for the Java Search related programs, hence here in this section we have listed down multiple searching Java programming examples.

• Java Program For Linear Search
• Java Program For Binary Search
• Java Program to Recursively Linearly Search an Element in an Array

This section is all about organizing things in your Java code. Here, you’ll learn how to create these “cabinets,” put things in them, and take them out whenever you need them.

• Java Program to Search an Element in an Array
• Java Program to Find the Largest Element in an Array
• Java Program to Sort an Array
• Java Program to Sort the Elements of an Array in Descending Order
• Java Program to Sort the Elements of an Array in Ascending Order
• Java Program to Remove Duplicate Elements From an Array
• Java Program to Merge Two Arrays
• Java Program to Check if Two Arrays Are Equal or Not
• Java Program to Remove All Occurrences of an Element in an Array
• Java Program to Find Common Array Elements
• Java Program to Copy All the Elements of One Array to Another Array
• Java Program For Array Rotation

This section dives into two-dimensional arrays, which are like spreadsheets for your code. Imagine organizing data in rows and columns, perfect for things like tables or images.

• Java Program to Print a 2D Array
• Java Program to Add Two Matrices
• Java Program to Sort the 2D Array Across Columns
• Java Program to Check Whether Two Matrices Are Equal or Not
• Java Program to Find the Transpose
• Java Program to Find the Determinant
• Java Program to Find the Normal and Trace
• Java Program to Print Boundary Elements of a Matrix
• Java Program to Rotate Matrix Elements
• Java Program to Compute the Sum of Diagonals of a Matrix
• Java Program to Interchange Elements of First and Last in a Matrix Across Rows
• Java Program to Interchange Elements of First and Last in a Matrix Across Columns

In this section, you will dive deep into working with text in Java. You’ll learn to manipulate, analyze, and modify strings, the fundamental building blocks of text data, with the help of multiple Java String programs.

• Java Program to Get a Character From the Given String
• Java Program to Replace a Character at a Specific Index
• Java Program to Reverse a String
• Java Program to Reverse a String Using Stacks
• Java Program to Sort a String
• Java Program to Swapping Pair of Characters
• Java Program to Check Whether the Given String is Pangram
• Java Program to Print first letter of each word using regex
• Java Program to Determine the Unicode Code Point at a given index
• Java Program to Remove leading zeros
• Java Program to Compare two strings
• Java Program to Compare two strings lexicographically
• Java Program to Print even length words
• Java Program to Insert a string into another string
• Java Program to Splitting into a number of sub-strings

Dive into the world of Java Lists, a fundamental data structure in Java. Here, you’ll learn how to store, access, and manipulate elements in a specific sequence.

• Java Program to Initializing a List
• Java Program to Find a Sublist in a List
• Java Program to Get Minimum and Maximum From a List
• Java Program to Split a list into Two Halves
• Java Program to Remove a Sublist from a List
• Java Program to Remove Duplicates from an Array List
• Java Program to Remove Null from a List container
• Java Program to Sort Array List in an Ascending Order
• Java Program to Get First and Last Elements from an Array List
• Java Program to Convert a List of String to Comma Separated String
• Java Program to Add Element at First and Last Position of a Linked list
• Java Program to Find Common Elements in Two ArrayList
• Java Program to Remove Repeated Element From An ArrayList

This section gives you to handle the ever-changing world of dates and times within your Java programs. Explore the working with calendars, timestamps, and time manipulation – essential skills for building applications that deal with deadlines, scheduling, or even historical data analysis.

• Java Program to Format time in AM-PM format
• Java Program to Display Dates of Calendar Year in Different Format
• Java Program to Display current date and time
• Java Program to Display time in different country’s format
• Java Program to Convert the local Time to GMT

Java File Programs empowers you to interact with files in Java. This section dives deep into reading, writing, and manipulating data stored outside your program.

• Java Program to Create a new file
• Java Program to Create a temporary file
• Java Program to Write into a file
• Java Program to Rename a file in java
• Java Program to Make a File Read-Only
• Java Program to Compare Paths of Two files
• Java Program to Copy one file into another file
• Java Program to Print all the Pattern that Matches Given Pattern From a File
• Java Program to Append a String in an Existing File
• Java Program to Read content from one file and writing it into another file
• Java Program to Read and printing all files from a zip file

This section navigate you to the world of directories and files in Java. Through this Java programming examples “Java Directory” section you’ll master creating, manipulating, and interacting with directories.

• Java Program to Traverse in a directory
• Java Program to Get the size of a directory
• Java Program to Delete a Directory
• Java Program to Create directories recursively
• Java Program to Search for a file in a directory
• Java Program to Find the current working directory
• Java Program to Display all the directories in a directory

Through a series of hands-on exercises on Java Exceptions and Errors Handling programs, you will easily get to know how to become a good Java programmer.

• Java Program to Show Runtime Exceptions
• Java Program to Show Types of Errors
• Java Program to Handle the Exception Hierarchies
• Java Program to Handle the Exception Methods
• Java program to Handle the Checked exceptions
• Java Program to Handle the Unchecked Exceptions
• Java Program to Handle Divide By Zero and Multiple Exceptions
• Java Program to Show Unreachable Code Error
• Java Program to Show Thread interface and memory consistency errors

Java Collections is not just about storing your data in Java; So practicing Java Collections programs will help you boost your organization skills. Get deep down into lists, sets, maps, and more, and discover how to structure your data effectively to build robust and efficient Java applications.

• Java Program to Use Different Types of Collection
• Java Program to Print a Collection
• Java Program to Compare Elements in a Collection
• Java Program to Get the Size of the Collection
• Java Program to Shuffle the Elements of a Collection
• Java Program to Reverse a Collection
• Java Program to Convert Collection into Array
• Java Program to Convert Array into Collection
• Java Program to Replace Elements in a List
• Java Program to Rotate Elements of a List
• Java Program to Iterate through Elements of HashMap

In this section you will get hand on Java Multithreading programs. It will help you to conquer the art of threading, a technique that lets your program handle multiple tasks seemingly at once.

• Java Program to Check the Thread Status
• Java Program to Suspend a thread
• Java Program to Join Threads
• Java Program to Show Daemon Thread

This section extends your coding experience with a diverse array of programs that explore more intricate functionalities. Brace yourself to tackle problems that involve algorithms, data manipulation, and object-oriented programming concepts.

• Java Program to Print Fibonacci Series in Different Ways
• Java Program to Convert Linked List to an Array
• Java Program to Convert Vector to a List
• Java Program to Convert String to a List of Characters
• Java Program to Convert Iterator to a List
• Java Program to Convert List to a Map
• Java Program to Convert List to a Stream
• Java Program to Convert List to Set
• Java Program to Convert InputStream to String
• Java Program to Convert Set of String to Array of String
• Java Program to Convert String to Object
• Java Program to Convert string value to byte value

In this article, we dealt with a variety of Java programming questions categorized as basic programs, control statements, Arrays , Strings , OOPs , and much more that are frequently asked in interviews and exams.

Each Java program will give you a different approach to solving a particular problem in Java. If you are new to Java programming, we highly recommend you to go through our article on Java tutorial , where we’ve covered all the basics and advanced topics of Java programming with practical examples and programs.

Click Here to Check out Java Exercise to Practice Java Problems Online.

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Java Switch Case Statement With Programming Examples

Learn about the Java Switch Statement, Nested Switch, other variations and usage with the help of simple examples:

In this tutorial, we will discuss the Java Switch statement. Here, we will explore each and every concept related to the Switch statement along with the programming examples and their description.

You will be provided enough examples that will let you understand the topic in a better way and will also enable you to create your programs whenever you are required to use the Switch statement.

Some of the frequently-asked questions are included so that you will be aware of the trending questions that are asked related to the Switch statement.

=> Take A Look At The Java Beginners Guide Here.

Table of Contents:

Rules For A Switch Statement

Switch case using for loop, the break is optional, finding ‘a’ and ‘b’ using nested switch, switch statement using string, wrapper in a switch statement, java enum in a switch statement, frequently asked questions, was this helpful, recommended reading, java switch statement.

In this tutorial, we will cover the following variations of the Java Switch statement.

• Switch statement
• Nested Switch statement (Inner and Outer Switch)

The Switch statement in Java is a branch statement or decision-making statement that provides a way to execute your code on different cases or parts that are based on the value of the expression or condition. More often than that, Java Switch statement provides a better alternative than the various options available with Java if-else statements.

Given below are the important rules for a Switch statement.

• Duplicate cases or case values are not allowed.
• The value of the Switch case should be of the same data type as the Switch case variable. For E.g. – if ‘x’ is of integer type in a “switch (x)”, then all the Switch cases should be of integer type.
• The Java break statements can be used (optional) to terminate the sequence of executables inside a case.
• The default statement is also optional. Usually, it is present at the end of a Switch statement. The default statement gets executed if none of the Switch cases match with the value of the Switch variable.
• The value of a Switch case must be a constant and not a variable.

Given below is the example program where we have demonstrated how Java Switch statement works or can be used in the programs. First of all, we have initialized the value of ‘i’ inside for loop and specified the condition.

Then, we have implemented the Switch statement with two cases and one default. The default statement will keep on executing until “i<5”. In this case, it will execute 2 times for “i=3” and “i=4”.

In Switch case Java, the break statement is optional. Even if you remove the break, the control of the program will flow to the next case.

Let’s consider the following example.

Nested Switch Statement

This involves the concept of an inner and outer Switch. We can use an inner Switch as a part of the statement of an outer Switch. This type of Switch statement is called the Nested Switch statement or Switch(Inner) inside a Switch(Outer) is known as a Nested Switch.

In the below example, we have used Scanner class to input ‘a’ and ‘b’ through the console. Then, we have made use of inner and outer Switch to lay down different cases for the value of both ‘a’ and ‘b’.

The control will flow through these inner and outer Switch statements and if the entered value matches, then it will print the value. Otherwise, the default statement will be printed.

In JDK 7.0 and above, we are allowed to use String objects in the Switch expression or condition.

Given below is the example where we have used Strings in the Switch statement. We can use Strings in a Switch statement just like Integers.

JDK 7.0 onwards, the Switch statement also works with the Wrapper class. Here, we are going to demonstrate Java Wrapper in a Switch statement.

In the below example, we have used an Integer class that wraps a value of the primitive type int in an object. Using this class, we have initialized a Wrapper variable ‘x’ with the value 3.

Using the Wrapper variable (inside a Switch Statement), we have defined three different cases along with one default case. Whichever case matches with the value of ‘x’, that particular case will be executed.

In JDK 7.0 and above, the Switch statement works well with Java enumeration. In this section, we will demonstrate the Java enum in a switch statement.

Here, we have created an enum called shoes with four constants that are basically shoe brands. Then, we have stored the enumerator in the reference-variable a1.

Using that reference-variable a1, we have initialized a Switch statement with four different cases. Whichever case matches with the reference-variable value, that particular case will get executed.

Q #1) What is a Java Switch statement?

Answer: The Switch statement in Java is a branch statement or decision-making statement (just like the Java if-else statement) that provides a way to execute the code on different cases. These cases are based on some expression or condition.

Mostly, the Java Switch statement has proven to be a better alternative for decision-making than the Java if-else statement.

Q #2) How do you write a Switch statement in Java?

Answer: Given below is a sample program where we have used the Switch statement. Here, we have taken an integer called brand with the value 4 and then used this integer in a Switch statement for different cases.

The brand’s integer value matches the case and then the statement of that particular case will be printed.

Q #3) Give a Switch Statement example.

Answer: There are plenty of examples of a Switch statement in this tutorial. We have given all the possible examples, be it Switch with Integer or Switch with String.

You can refer to the examples given at the beginning of this tutorial so that you will be aware of the basics of a Switch statement and how it is used with the loops. (Refer to the “Switch case using for loop” section)

Q #4) Do you need a default case in a switch statement?

Answer: No, it is not mandatory to use the default case whenever dealing with the Switch statement.

For instance, if you see the below example where we have not used a default case. Even though we do not use the default case, the program will execute perfectly as long as it finds the matching case.

In this tutorial, we have discussed the Java Switch statement along with the syntax, description, and flowchart. One other variation which is the Nested Switch statement is also discussed in detail with the proper examples including the concept of inner and outer Switch.

Further reading =>> MySQL CASE Statement with examples

Some frequently asked questions are also provided here so that you will be able to know the trending questions related to the Java Switch statement. These decision making statements will be helpful when you want to segregate the code based on some condition or expression and want to check multiple cases.

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