what is case study in java

Java Gently, Third Edition by Judith Bishop

Get full access to Java Gently, Third Edition and 60K+ other titles, with a free 10-day trial of O'Reilly.

There are also live events, courses curated by job role, and more.

List of Examples and Case Studies

Get Java Gently, Third Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Don’t leave empty-handed

Get Mark Richards’s Software Architecture Patterns ebook to better understand how to design components—and how they should interact.

It’s yours, free.

Check it out now on O’Reilly

Dive in for free with a 10-day trial of the O’Reilly learning platform—then explore all the other resources our members count on to build skills and solve problems every day.

Part IX Case Studies

Part IX presents case studies that use a variety of Java EE technologies. This part contains the following chapters:

Chapter 51, Duke's Bookstore Case Study Example

Chapter 52, Duke's Tutoring Case Study Example

Chapter 53, Duke's Forest Case Study Example

Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Legal Notices

Scripting on this page tracks web page traffic, but does not change the content in any way.

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.

Automating Dua Kelinci’s Careers with Algobash.com

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

Navigation Menu

Search code, repositories, users, issues, pull requests..., provide feedback.

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly.

To see all available qualifiers, see our documentation .

Here are 45 public repositories matching this topic...

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

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

puumCore / ms-customer-management

Case study solution as the technical interview for a position at this company.

• Updated Sep 27, 2024

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 Sep 5, 2024

YusufDagdeviren / Akbank-Web3-Practicum

Akbank Web3 Practicum için yapmış olduğum OOP case

• 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 Sep 21, 2024

puumCore / jungophram-ecommerce

• Updated Sep 1, 2024

hkristanto / JHotDraw

• Updated Jun 14, 2017

Improve this page

Add a description, image, and links to the case-study topic page so that developers can more easily learn about it.

Curate this topic

Add this topic to your repo

To associate your repository with the case-study topic, visit your repo's landing page and select "manage topics."

• Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers
• Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand
• OverflowAI GenAI features for Teams
• OverflowAPI Train & fine-tune LLMs
• Labs The future of collective knowledge sharing
• About the company Visit the blog

Collectives™ on Stack Overflow

Find centralized, trusted content and collaborate around the technologies you use most.

Q&A for work

Connect and share knowledge within a single location that is structured and easy to search.

Get early access and see previews of new features.

Case Study in java

Could anyone provide me information where I can find the case study for java coding and design practice.

Basically looking for a case studies which resemble to the real time application like pet Store application, flight search application.

• 1 sounds like homework. more details, on what you want to accomplish here, is required. –  Nishant Commented Jan 4, 2011 at 6:29
• Hi Nishant, I am looking to learn the java concepts like multi thread, collections from a business point of view. Like for a given scenario what collection class to use. –  Kamal Commented Jan 4, 2011 at 7:03
• Something worth nothing is that "real time" has a specific meaning and is not the same real world. The Pet Store application isn't real-time and possibly not that close to a real-world application either. ;) –  Peter Lawrey Commented Jan 4, 2011 at 7:08
• @Peter- I mean case studies which will help me the to learn how to apply the java concepts for best result. –  Kamal Commented Jan 4, 2011 at 7:19
• If you want real world code, I suggest you look at some of the popular open source packages. e.g. download.java.net/openjdk/jdk6 java-sources.net This should ive you a few million lines of code. –  Peter Lawrey Commented Jan 4, 2011 at 17:08

The Design Patterns Java Companion teaches good design practices with the help of small Java applications. (Not sure if the free online copy of this book is legal or not).

Your Answer

Reminder: Answers generated by artificial intelligence tools are not allowed on Stack Overflow. Learn more

Sign up or log in

Post as a guest.

Required, but never shown

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy .

Not the answer you're looking for? Browse other questions tagged java or ask your own question .

• The Overflow Blog
• Masked self-attention: How LLMs learn relationships between tokens
• Deedy Das: from coding at Meta, to search at Google, to investing with Anthropic
• Featured on Meta
• User activation: Learnings and opportunities
• Preventing unauthorized automated access to the network
• Feedback Requested: How do you use the tagged questions page?

Hot Network Questions

• What is the origin of the many extra mnemonics in Manx Software Systems’ 8086 assembler?
• How does Linux kernel use Intel SGX (Software Guard Extensions)?
• Book where a parent recounts an anecdote about a painting of a Russian sled pursued by wolves
• What is the name for this BC-BE back-to-back transistor configuration?
• why `tcpdump -i any` can't capture unicast traffic in br0 whilst `tcpdump -i br0` can?
• How does a rotating system behave as mass varies?
• Remove an entire inner list that has any zeros
• Is there a fast/clever way to return a logical vector if elements of a vector are in at least one interval?
• Is a 1500w inverter suitable for a 10a portable band saw?
• God the Father punished the Son as sin-bearer: how does that prove God’s righteousness?
• What does "we are out"mean here?
• Can one freely add content to a quotation in square brackets?
• How to fix bottom of stainless steel pot that has been separated from its main body?
• How do you measure exactly 31 minutes by burning the ropes?
• BTD6 Kinetic Chaos (9/26/24 Odyssey)
• Do pilots have to produce their pilot license to police when asked?
• Taking out the film from the roll can it still work?
• \ContinuedFloat with three table not working
• How to write an Antagonist that is hot, manipulative, but has good reasoning for being the 'villain'?
• is it correct to say "can you stop clinking the cup of coffee"?
• Why am I getting slow transfer speeds on USB 3.0 to SATA connector?
• Why is my Lenovo ThinkPad running Ubuntu using the e1000e Ethernet driver?
• Matter made of neutral charges does not radiate?
• Is it possible that the roots of a biquadratic equation will be in A.P. , G.P. , H.P.?

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.

Related Articles

Java 8 Streams – Group By Multiple Fields with Collectors.groupingBy()

Java program to calculate average using arrays, 150 java interview questions and answers – the ultimate list (pdf download & video), java 8 streams filter with multiple conditions examples, java arraylist insert/replace at index, switch as an expression in java with lambda-like syntax, 13 best java decompilers for download and online use for java developers, how to format/parse dates with localdatetime in java 8 – example tutorial.

This site uses Akismet to reduce spam. Learn how your comment data is processed .

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 »

Welcome to the Clean Coders Java Case Study. This is Episode 1.

Over the next weeks and months, Micah and Uncle Bob will re-implement the cleancoders.com website in Java before your very eyes. You'll see them applying all the principles, patterns, and practices that you've been learning in the Clean Code series . But instead of learning about those principles, patterns, and practices, you'll see how they use them in real life.

The first episode is entitled Getting Nothing Done because in this episode they use the first acceptance tests in FitNesse to set up the infrastructure and facilities they need to start getting real stories implemented. They do finish one story, but it's the story of the null case.

So get ready for some fun and education and you watch these two seasoned professionals work together to create a web system in Java.

If you want to follow along with the code, you can find it on Github: https://github.com/cleancoders/CleanCodeCaseStudy

Get started with Terenbro development team.  

We offer QA&PM services for Free.

Magento is a variety of powerful systems and tools for e-commerce website development

Java is one of the most powerful platform for server-side web development

Angular is a popular design framework and development platform for creating robust web applications

• Popular Java Use Cases in Development

By Terenbro

July 31, 2023

Let's discuss your project!

We’re ready to help! Get consulted with our specialists at no charge.

Leave your contact details and We will contact you within 24 hours

Attach file

What Do Businesses Use Java For?

8 top java use case, consider terenbro as your trusted partner.

TOP-5 Posts

• Complete Guide to Magento 2 Speed Optimization
• 11 Large Companies That Use Java

Java has consistently ranked among the top programming languages in the world, demonstrating its enduring popularity and relevance in the software development landscape. As per Statista , Java enjoys a substantial market share of approximately 33.27%, reinforcing the significance of Java use cases for businesses and organizations across various industries.

Did you know?

• Java is used significantly in South Korea (53%), China (47%), and Germany (33%). ( JetBrains )
• Around 49% of globally active developers agreed to use Java in 2022, which is a significant rise from 39% in 2020 Q3. ( SlashData State the Developer Nation report )
• The popularity rate of Java is growing by 155%. ( Hacker Rank )

Whether you are a seasoned developer or new to the field, this comprehensive article will provide valuable insights into why Java is a well-suited for building applications. So read on to learn more about real-world Java use cases and how this versatile language can be used to create innovative and impactful solutions.

Java is one of the most versatile and easy-to-use programming languages, with an unmatched community on GitHub and worldwide. As per a Stackoverflow 2021 report , around 35.35% of programmers still use Java because of its various features.  

Some of the main reasons why businesses prefer applications of Java language are:

• High Security: Java is a highly secure and protected system from the harm of malicious codes. Building applications on Java ensures the safety of your and your customer’s sensitive data.
• Platform-Independent: Being platform-independent, Java provides the ease of developing apps suitable for any device or OS with little-to-none adjustments.
• Object-Oriented: As Java is object-oriented, the codes have proper organization around the objects. This helps in making the code reusable and easy to understand.
• Robustness: Java provides faster performance for the apps as they are compiled in bytecode. Not only does it provide fast execution, but it also helps developers quickly find errors and fix them before they do any damage.

Java's ease of use, platform independence, and functionality make it popular among developers and businesses. Here are some of the prominent use cases of Java in the real world:

Scientific Application

Scientific app development is one of the most common use cases for Java-based development. With the help of Java's ability to handle huge amounts of data, scientists can efficiently perform long and complicated computational tasks. Besides, Java has a wide selection of libraries, like Apache Commons Math, JAMA, and JOONE, that provide apps with the ability to gather statistics, manage algebra operations, and benefit from machine learning.

Some of the popular scientific Java applications examples are as follows:

• MATLAB (Mathematics Laboratory)
• Weka (for Machine Learning)

Source: MATLAB- MathWorks

Mobile Applications

Java Micro Edition is a cross-platform system that streamlines the task of building and testing mobile applications. Java's platform independence and portability simplify the app's development process for tablets, embedded systems, and smartphones.

Below are the famous Java use cases for mobile applications:

• Google Earth

Source: Netflix

 Cloud Applications

The main benefit why Java being used for cloud application development is its WORA (Write Once Run Anywhere) feature. You don't have to make major adjustments to the Java code for the app to work on almost any device, which saves costs and helps you reach a wider audience.

Below are a few of the most popular Java use-case examples of cloud applications:

Source: Twitter

Education Applications

Today's education looks very different from what it was around 30 days ago, thanks to the technology trends . Many companies are now focusing on providing remote or hybrid learning. For this reason, businesses are relying on professional Java developers to create an engaging, cross-platform educational application that increases the learning experience for students. 

Well, you must be wondering what are the applications of Java in the education sector. Some famous use cases for Java in e-learning are as follows:

Source: Moodle

Game Applications

It's a no-brainer that various games have been developed using Java. If you go back to the early 2000s, you'd probably recall that every time you launched a game on your phone, you'd come across the Java symbol appearing on your screen. Now, developers benefit from Java's rich libraries support, specifically designed for game development, and a high optimization level for such applications.

Some of the most popular Java use cases for Android games are:

• Spiral Knights

Desktop GUI Application

Since Java is an OOP language, building and maintaining complex desktop GUI programs, whether for games or development environments, won't be a problem. Thanks to the main concepts of Java, such as encapsulation, inheritance, and polymorphism, you can create a well-structured and scalable GUI code.

Below are a few popular Java use cases of the desktop GUI apps:

• NetBeans IDE

AR and AI Applications

As we move towards a developed future, we see rapid adoption of Augmented Reality (AR) and Artificial Intelligence (AI). And even though Python's ease of use and extensive libraries ensured leading positions in the AI-powered sector, Java still remains a perfect tool for creating cross-platform solutions with the latest innovations in deep machine learning. Moreover, Java has several neural frameworks (Deeplearning4j, DLJava, Neuroph, etc.) specifically designed to facilitate various AI-related tasks.

As far as AR is concerned, Android AR games are one of the best real-world use cases of Java. With the help of Java 3D API, developers can easily create 3D virtual worlds. And, as most AR apps are now available on wearable devices like helmets, glasses, or contact lenses, this increases the demand for cross-platform capabilities and, therefore, the need for a Java-developed platform .

Some popular examples of programs that are created on Java are:

• Multi-Robot system
• Machine Learning solution
• Search algorithm
• Genetic Programming

Trading Apps

Most traders require an app for convenient management of their assets that they can access anywhere and on any device. But flexibility is not the only concern, the main cornerstone of such a development is the security of their data. And Java-based apps excel in both, providing a highly protected, cross-platform solution where developers have access to all the system resources, guaranteeing user data protection.

Popular trading apps developed using Java are:

Source: Murex

Sign Up for our newsletter

Get front-row industry with our monthly newsletter

If you want to develop Java-based applications, Terenbro is your go-to platform. With our Java development services , you can be sure to receive high-performing and smooth-functioning applications. 

At Terenbro , we have developed applications of the Java programming language across different sectors like Sports, Banking and Finance, Accounting, and more. With a very streamlined and simple approach to Java development , we work towards developing Java-based applications for businesses in different niches. 

Having catered to 50+ clients and a team with 50+ years of combined experience, we can provide exactly what you're looking for.

Apart from the abovementioned industries, Java has been used to develop apps across numerous sectors like Finance, Gaming, Big Data, and more. Businesses that are yet not harnessing the power of Java are losing out on a lot and are staying behind. 

It is time businesses upgrade and use Java for their web or mobile applications. However, integrating Java isn't an easy task and would require the expertise of professionals. If you're searching for expert Java developers who will make your business function smoothly, Terenbro can help you in this profitable endeavor.  

So, don't hold back any longer. Whether you want to develop Java-based apps or want to know its perks, reach out to Terenbro . 

What type of companies uses Java?

Java has become the default programming language for software application development. The industries where java programming is used include e-commerce, e-learning, investment and trading, gaming, and many others.

What are the real-world Java use cases in the gaming industry?

Game development is surely one of the most popular applications of Java in the real world. The Java language is used for numerous subcategories, like casual games (Bejeweled), 2D games (Plants vs. Zombies), educational games (Kodu Game Lab), browser-based games (Runescape), and others.

How can I build cloud-native applications with professionals?

Java is a popular choice for building microservices and cloud-native applications. As a result, professional Java developers at Terenbro create highly modular and distributed systems. Java's compatibility with cloud platforms, containerization technologies like Docker, and orchestration tools like Kubernetes further enhance its suitability for cloud-native development.

0/5 (0 votes)

Get in touch Let's discuss your project

We prepare a rough estimate

We contact you within 24 hours

Our team respects your privacy

• 800+ Q&As Menu
• Why java-success.com?
• What are the benefits?
• PDF downloads
• Privacy Policy
• Your - Resume writing skills
• Your - Resume samples
• Your - Self-taught success?
• Your - Feeling stagnated?
• Your - Earning more?
• Your - Freelancing
• Your - Job offers 2-6?
• Your - Certification
• Your - Job hunting tips
• Your - Soft skills
• Your - Blogging benefits
• Your - Job interviews
• Your - Lack of motivation?
• Your - Philosophies
• Your - Rants
• 300+ Java Interview FAQs 🔥
• 150+ Java Architect interview FAQs 🔥
• 100+ SQL Interview FAQs 🔥
• 50+ Unix Interview FAQs 🔥
• 20+ CI/CD & DevOps Interview FAQs 🔥
• 300+ Big Data Interview FAQs 🔥
• 250+ Python interview FAQs 🔥
• 20+ Apache Spark Interview FAQs 🔥
• 20+ Git Interview FAQs 🔥
• 150+ Companion Tech Interview Q&As
• 250+ Scala Interview FAQs
• 150+ Java coding interview Q&As
• 100+ Java code quality interview Q&As
• 150+ Spring & Hibernate Interview FAQs
• Membership Levels
• Membership Billing
• Membership Checkout
• Membership Invoice
• Membership Account
• Membership Cancel

18 Java scenarios based interview Q&As for the experienced – Part 1

Let’s look at scenarios or problem statements & how would you go about handling those scenarios in Java. These scenarios interview questions will judge your Java experience. Full list of Java scenarios based interview questions are covered at Judging your…

500+ Java Interview FAQs

500+ big data interview faqs, 16+ java key areas to go places, 150+ companion techs q&as, 800+ enterprise & core java q&as, java & big data tutorials, popular posts:.

• 800+ Java Interview Questions & Answers with code, scenarios, diagrams & FAQs (13,222)
• 00: Top 50+ Core Java interview questions & answers for 1 to 3 years experience (5,234)
• Java 8 String streams and finding the first non repeated character with functional programming (2,222)
• 500+ Big Data Interview Questions & Answers with code, scenarios, diagrams & FAQs (2,143)
• 18 Java scenarios based interview Q&As for the experienced – Part 1 (2,080)
• 02: 10 Java String class interview Q&As (954)
• 01: 30+ Java architect interview questions & answers – Part 1 (791)
• Membership Levels (766)
• 30+ Java Code Review Checklist Items (591)
• 01: 15+ Java multithreading interview questions & answers (537)
• 00: A roadmap to become a Big Data Engineer – What skills are required? (516)
• 0: 50+ SQL scenarios based interview Q&As – What is wrong with this SQL code? (485)
• 01: 13 Java low latency interview questions & answers (437)
• 11a: 40+ Apache Spark best practices & optimisation interview FAQs – Part 1 (412)
• 17 Java getting started interview questions and answers (371)
• Latest Posts

• 800+ Java Interview Questions & Answers with code, scenarios, diagrams & FAQs - September 9, 2024
• 500+ Big Data Interview Questions & Answers with code, scenarios, diagrams & FAQs - September 7, 2024
• 03: Spring Boot annotations interview Q&As – Part 1 - September 7, 2024
• Feeling stagnated?
• How to earn more?
• Freelancing Vs contracting?
• Self-taught experience is better than no experience.
• Job Interview Tips

Java as a systems programming language: three case studies

Cite this chapter.

• J. M. Bishop 2  

Part of the book series: IFIP Advances in Information and Communication Technology ((IFIPAICT))

7634 Accesses

1 Citations

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.

Download to read the full chapter text

Chapter PDF

Similar content being viewed by others.

Programming with Actors in Java 8

Endorsing Supercomputing Applications to Java Language

Introduction to Java

• distributed systems
• web computing
• language design

Atkinson M. et al (1996), Design issues for persistent Java: a type-safe, object-oriented, orthogonally persistent system, Seventh International Workshop on Persistent Object Systems.

Google Scholar  

Ben-Ari M. (1997), Distributed algorithms in Java, Proc. of the ACM-SIGCSESIGCUE Conference on Integrating Technology into Computer Science Education, Uppsala, 62–64.

Botha L., Bishop J. and Serbedzija N. (1997), Extending the client-server model for web-based execution of applications, Proceedings of the SAICSIT Conference, Vanderbijlpark.

Chatterjee S., Paramasivam M. and Yakowenko W. (1997), Architecture for a web-accessible simulation environment, IEEE Computer 30 (6) 88–91.

Article   Google Scholar  

Coetzee S. (1997), Distributed open spatial query mechanisms, MSc thesis, University of Pretoria.

Hughes M. (1997), Java: to Mars and beyond, http://java.sun.com/features/1997/july/mars.html , visited on 31 August 1997.

JavaSoft (1997), http://javasoft.com/100percent/latestlist.html , visited on 19 September 1997

Leppinen M., Pulkkinen P. and Rautiainen A. (1997), Java and CORBA-based network management, IEEE Computer 30 (6) 83–87.

Munson J.P. and Dewan P. (1997), Synch: a Java framework for mobile collaborative applications, IEEE Computer 30 (6) 59–66.

Schaller N. et al (1997), Using Java in computer science education, Proc. of the ACM-SIGCSE-SIGCUE Conference on Integrating Technology into Computer Science Education, Uppsala, 140–142.

Serbedzija N., Botha A., Abbot A. and Bishop J. (1997), Web computing skeleton: a case study, Proceedings of the Workshop on Parallel and Distributed Computing, ICSE, Boston.

Sun (1997), http://java.sun.com , visited 17 September 1997.

Download references

Author information

Authors and affiliations.

University of Pretoria Computer Science Department, 0002, Pretoria, South Africa

J. M. Bishop

You can also search for this author in PubMed   Google Scholar

Editor information

Editors and affiliations.

University of Victoria, Victoria, Canada

R. N. Horspool

Rights and permissions

Reprints and permissions

Copyright information

© 1998 IFIP

About this chapter

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

Download citation

DOI : https://doi.org/10.1007/978-0-387-35350-0_6

Publisher Name : Springer, Boston, MA

Print ISBN : 978-1-5041-2873-5

Online ISBN : 978-0-387-35350-0

eBook Packages : Springer Book Archive

Share this chapter

Anyone you share the following link with will be able to read this content:

Sorry, a shareable link is not currently available for this article.

Provided by the Springer Nature SharedIt content-sharing initiative

• Publish with us

Policies and ethics

• Find a journal
• Track your research

Java Tutorial

Java methods, java classes, java file handling, java how to's, java reference, java examples.

Java is a popular programming language.

Java is used to develop mobile apps, web apps, desktop apps, games and much more.

Examples in Each Chapter

Our "Try it Yourself" editor makes it easy to learn Java. You can edit Java code and view the result in your browser.

Try it Yourself »

Click on the "Run example" button to see how it works.

We recommend reading this tutorial, in the sequence listed in the left menu.

Java is an object oriented language and some concepts may be new. Take breaks when needed, and go over the examples as many times as needed.

Java Exercises

Test yourself with exercises.

Insert the missing part of the code below to output "Hello World".

Start the Exercise

Advertisement

Test your Java skills with a quiz.

Start Java Quiz

Learn by Examples

Learn by examples! This tutorial supplements all explanations with clarifying examples.

See All Java Examples

My Learning

Track your progress with the free "My Learning" program here at W3Schools.

Log in to your account, and start earning points!

This is an optional feature. You can study at W3Schools without using My Learning.

You will also find complete keyword and method references:

Java Keywords

Java String Methods

Java Math Methods

Java Output Methods

Java Arrays Methods

Java ArrayList Methods

Java LinkedList Methods

Java HashMap Methods

Java Errors and Exception Types

Download Java

Download Java from the official Java web site: https://www.oracle.com

Java Exam - Get Your Diploma!

Kickstart your career.

Get certified by completing the course

COLOR PICKER

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: [email protected]

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail: [email protected]

Top Tutorials

Top references, top examples, get certified.

• Java Course
• Java Arrays
• Java Strings
• Java Collection
• Java 8 Tutorial
• Java Multithreading
• Java Exception Handling
• Java Programs
• Java Project
• Java Collections Interview
• Java Interview Questions
• Spring Boot

Classes and Objects in Java

In Java, classes and objects are basic concepts of Object Oriented Programming (OOPs) that are used to represent real-world concepts and entities. The class represents a group of objects having similar properties and behavior. For example, the animal type Dog is a class while a particular dog named Tommy is an object of the Dog class.

In this article, we will discuss Java objects and classes and how to implement them in our program.

Java Classes

A class in Java is a set of objects which shares common characteristics/ behavior and common properties/ attributes. It is a user-defined blueprint or prototype from which objects are created. For example, Student is a class while a particular student named Ravi is an object.

Properties of Java Classes

• Class is not a real-world entity. It is just a template or blueprint or prototype from which objects are created.
• Class does not occupy memory.
• Class is a group of variables of different data types and a group of methods.
• Data member
• Constructor
• Nested Class

If you’re looking to gain a deeper understanding of Java and its object-oriented principles, exploring a comprehensive Java Programming Online course can be a valuable step. It will help you master the core concepts of classes and objects, and how to effectively use them in building robust Java applications.

Class Declaration in Java

Example of java class, components of java classes.

In general, class declarations can include these components, in order:

Modifiers : A class can be public or has default access (Refer this for details). Class keyword: class keyword is used to create a class. Class name: The name should begin with an initial letter (capitalized by convention). Superclass(if any): The name of the class’s parent (superclass), if any, preceded by the keyword extends. A class can only extend (subclass) one parent. Interfaces(if any): A comma-separated list of interfaces implemented by the class, if any, preceded by the keyword implements. A class can implement more than one interface. Body: The class body is surrounded by braces, { }.

Constructors are used for initializing new objects. Fields are variables that provide the state of the class and its objects, and methods are used to implement the behavior of the class and its objects. There are various types of classes that are used in real-time applications such as nested classes , anonymous classes , and lambda expressions .

Java Objects

An object in Java is a basic unit of Object-Oriented Programming and represents real-life entities. Objects are the instances of a class that are created to use the attributes and methods of a class.  A typical Java program creates many objects, which as you know, interact by invoking methods. An object consists of :

• State : It is represented by attributes of an object. It also reflects the properties of an object.
• Behavior : It is represented by the methods of an object. It also reflects the response of an object with other objects.
• Identity : It gives a unique name to an object and enables one object to interact with other objects.

Example of an object: dog

Objects correspond to things found in the real world. For example, a graphics program may have objects such as “circle”, “square”, and “menu”. An online shopping system might have objects such as “shopping cart”, “customer”, and “product”.

Note: When we create an object which is a non primitive data type, it’s always allocated on the heap memory.

Declaring Objects (Also called instantiating a class)

When an object of a class is created, the class is said to be instantiated . All the instances share the attributes and the behavior of the class. But the values of those attributes, i.e. the state are unique for each object. A single class may have any number of instances.

Java Object Declaration

As we declare variables like (type name;). This notifies the compiler that we will use the name to refer to data whose type is type. With a primitive variable, this declaration also reserves the proper amount of memory for the variable. So for reference variables , the type must be strictly a concrete class name. In general, we can’t create objects of an abstract class or an interface.

If we declare a reference variable(tuffy) like this, its value will be undetermined(null) until an object is actually created and assigned to it. Simply declaring a reference variable does not create an object.

Initializing a Java object

The new operator instantiates a class by allocating memory for a new object and returning a reference to that memory. The new operator also invokes the class constructor.

Initialize by using method/function:

This class contains a single constructor. We can recognize a constructor because its declaration uses the same name as the class and it has no return type. The Java compiler differentiates the constructors based on the number and the type of the arguments. The constructor in the Dog class takes four arguments. The following statement provides “tuffy”, “papillon”,5, and “white” as values for those arguments:

The result of executing this statement can be illustrated as :

Memory Allocation of Java Objects

Note: All classes have at least one constructor. If a class does not explicitly declare any, the Java compiler automatically provides a no-argument constructor, also called the default constructor. This default constructor calls the class parent’s no-argument constructor (as it contains only one statement i.e super();), or the Object class constructor if the class has no other parent (as the Object class is the parent of all classes either directly or indirectly).

Ways to Create an Object of a Class

There are four ways to create objects in Java. Strictly speaking, there is only one way(by using a new keyword), and the rest internally use a new keyword.

1. Using new keyword

It is the most common and general way to create an object in Java.

2. Using Class.forName(String className) method

There is a pre-defined class in java.lang package with name Class. The forName(String className) method returns the Class object associated with the class with the given string name. We have to give a fully qualified name for a class. On calling the new Instance() method on this Class object returns a new instance of the class with the given string name.

3. Using clone() method

clone() method is present in the Object class. It creates and returns a copy of the object.

4. Deserialization

De-serialization is a technique of reading an object from the saved state in a file. Refer to Serialization/De-Serialization in Java

Creating multiple objects by one type only (A good practice)

In real-time, we need different objects of a class in different methods. Creating a number of references for storing them is not a good practice and therefore we declare a static reference variable and use it whenever required. In this case, the wastage of memory is less. The objects that are not referenced anymore will be destroyed by the Garbage Collector of Java.

In the inheritance system, we use a parent class reference variable to store a sub-class object. In this case, we can switch into different subclass objects using the same referenced variable.

Anonymous Objects in Java

Anonymous objects are objects that are instantiated but are not stored in a reference variable.

• They are used for immediate method calls.
• They will be destroyed after method calling.
• They are widely used in different libraries. For example, in AWT libraries, they are used to perform some action on capturing an event(eg a key press).
• In the example below, when a key button(referred to by the btn) is pressed, we are simply creating an anonymous object of EventHandler class for just calling the handle method.

Difference between Java Class and Objects

The differences between class and object in Java are as follows:

Mastering the concepts of classes and objects is essential for any Java programmer. These foundational elements of Java allow for the creation of robust and scalable software designs. Understanding how to effectively use classes and objects can help you write more organized and modular code, which is easier to manage and extend.

Similar Reads

Please login to comment....

• Best Smartwatches in 2024: Top Picks for Every Need
• Top Budgeting Apps in 2024
• 10 Best Parental Control App in 2024
• Top Language Learning Apps in 2024
• GeeksforGeeks Practice - Leading Online Coding Platform

Improve your Coding Skills with Practice

What kind of Experience do you want to share?

Mechanical approach for creating different molecular adducts and regulating salt polymorphs: A case study of the anti-inflammatory medication Ensifentrine

(note: the full text of this document is currently only available in the pdf version ).

Ananya Kar , Lopamudra Giri , Gowtham Kenguva , Smruti Rekha Rout and Rambabu Dandela

First published on 20th September 2024

An intriguing technique for crystal engineering is mechanochemistry, which frequently yields solid forms (salt, cocrystal and polymorphs, etc.) that are challenging to acquire by traditional solution-based approaches. However, generating new and potentially beneficial solid forms remains an ongoing task in this field. Moving forward in this demanding arena, several molecular adducts (salts and salt polymorphs) of the model drug, Ensifentrine (ENSE) with GRAS (Generally Recognized as Safe) co-former, were synthesised for the first time using a mechanochemical technique followed by a slow evaporation crystallisation procedure. All the newly obtained solid forms were characterized by Single Crystal X-ray Diffraction (SCXRD), Powder X-Ray Diffraction (PXRD), Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC)). Crystal structure analysis verified salt generation, revealing proton transfer from the carboxylic acid group of salt formers to the mesitylimino nitrogen atom of ENSE. Additionally, the phase transition behaviour of the produced salt polymorphs was examined by Variable Temperature PXRD (VT-PXRD) analysis. Furthermore, a detailed discussion of the physicochemical features of these recently produced entities was carried out and their solubility in pH 1.2 and pH 7 environments was examined. The results demonstrate that, as compared to the parent drug, the binary adduct's solubility rate has significantly increased at pH 7. Moreover, a thorough examination of the residue recovered after solubility confirmed that the majority of the molecular adducts were stable at pH 7 and did not show any phase change or dissociation, whereas at pH 1.2, the majority of the adducts were stable, with the exception of those generated with malonic acid, which moved into a new stable form, and a comprehensive study revealed that it converted into ENSE.Cl salt. To the best of our knowledge, this is the first work to investigate various forms of ENSE, and mechanical energy may be employed as a powerful control parameter to produce novel solid forms with superior physicochemical features. We hope that the current discovery will offer some valuable outlook prior to the ENSE drug formulation.