The Best of Java Interview Questions

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The Best of Java Interview Questions

Some our best articles for those preparing for their next job search. We cover data structures, core Java, multithreading, Spring, and system design.

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Whether you're a seasoned Senior Engineer or a programmer just out of college looking for your first job, you all face the same, often unfortunate, equalizer of the technical interview. For some, this means solving some esoteric problem with a skill set that you'll use twice in the actual job. For others, it's a more practical assessment of how your past experience will translate to a new role, a new set of responsibilities. 

Below, we've compiled some our best articles for those preparing for their next job search or panicking a touch as the interview date gets closer and closer. Rest assured, you'll all do well, maybe even great.

Data Structures 

The Ultimate Interview Preparation Guide [Link List] by James Sugrue: Everyone could use some help with interviewing, even the most seasoned developers. Take a look at this list that should help you prepare for any IT path.

Algorithm and Data Structure Interview Questions for Java and Python by Javin Paul: A software developer goes over a list of 50 interview questions related to data structures and coding that will serve any coder or data scientist well.

20+ Linked List Interview Questions for Java Programmers by Javin Paul: This article is for any young or new developer seeking out interview prep on topics related to linked lists in Java and potential solutions.

Top 50 Java Collections Interview Questions by Javin Paul: These are frequently asked Java interview questions from Java Collections framework and you should review them before going for interviews

Additional Resources

The Best of Java Collections [Tutorials]: This post contains a number of articles dedicated to the JCF, as well as articles pertaining to performance, Collection interfaces, and Maps. Enjoy!

Your Guide to Java Streams [Tutorials and Articles]: In this edition of "Best of DZone", we take a look at Streams in Java, one of the APIs that brought some elements of functional programming to Java.

Core Java

10 Tricky Interview Questions for Java Devs by Ajitesh Kumar: These 10 Java questions are likely to come your way in a Java interview. Be ready to explain passing by value, breaking out of nested loops, and reflection.

Top 25 Java Interview Questions and Answers by Pramod Kumar Srivastava: This post explores some of the top Java developer interview questions, including JSON, JDK, classes, data types, and more, as well as useful interview tips.

Top 10 Java Interview Questions That I Recently Faced by Zoltan Raffai: This post looks at the top Java interview questions, highlighting subjects such as singleton, objects, experience, Java 7 and 8, collection types, and more!

Top 20 Java Interview Questions by Hiring Investment Banks by Javin Paul: In this post, we will take a look at the top 20 interview questions from investment banks, aside from data structures and algorithms, for Java developers.

Additional Resources

Core Java by Cay Horstmann and Ivan Ivanov: This Refcard gives you an overview of key aspects of the Java language and references on the core library, commonly used tools, and Java 8 features.

All Things Java 8 [Tutorials]: Java 8 brought a lot of changes to the JVM. Here's a DZone guide to all things Java 8, including tutorials on FP concepts, lambda expressions, and more.

Multithreading and Concurrency

Top 80 Thread- Java Interview Questions and Answers (Part 1) by Ankit Mittal: One of the most comprehensive list of thread-related questions you'll find, this series covers everything, so beginners and experts alike will walk away prepped for any question thrown their way. 

Top 15 Java Multithreading, Concurrency Interview Questions With Investment Banks by Javin Paul: In this post, we look at the top 15 Java-related interview questions from investment banks, specifically questions pertaining to concurrency and multithreading.

Additional Resources

Java Thread Tutorial: Creating Threads and Multithreading in Java by Samarpit Tuli: Here's a brief introduction to Java Thread concepts that many people find tricky like multithreading and concurrency.

Intricacies of Multi-Threading in Java by Sumith Puri: You can never have enough threads. Well, you can, but be sure you know how they work first. This is a comprehensive look at multi-threading throughout the ages.

Multi-Threading in Spring Boot Using CompletableFuture by Swathi Prasad: Check out this post to learn more about multi-threading in Spring Boot using CompleteFuture to write asynchronous, non-blocking, and multi-threaded code.

Java Multi-Threading With the ExecutorService by Brian Hannaway: Multi Threading with ExecutorService. In this post, we'll look how the ExeutorService can be used to run multi-threaded asynchronous tasks. 

Spring Framework

Top 20 REST and Spring MVC Interview Questions for Java Developers by Javin Paul: This post takes a look at the top 20 frequently-asked REST and Spring MVC interview questions for Java developers applying for web developer positions.

Top 20 Spring MVC Interview Questions for Java Programmers by Javin Paul: Interviewing for a position developing Spring MVC-based applications requires a lot of preparation. Let's take a look at these top 20 Spring MVC questions.

Top 10 Spring Boot Interview Questions by Manoj Kumar Bardhan: Prepare for your next Spring Boot interview with these most common interview questions on everything from annotations to classes and more.

Additional Resources

All About Spring Boot [Tutorials and Articles]: A compendium of articles by DZone members including explanations of the concepts behind the framework, Spring Boot tutorials, and Spring Boot interview questions.

Put a Spring in Your Step: Spring Framework Tutorials: A collection of the best articles on DZone covering questions like what is the Spring framework, how to develop apps using Spring, and how to work with beans.

Dependency Injection in Spring by Justin Albano: Take a deep dive into Dependency Injection in Spring — what it is, how and when to use, and why it makes Spring such a powerful framework.

4 Spring Annotations Every Java Developer Should Know by Justin Albano: Let's dive into the most pertinent annotations available in Spring, paying close attention to concepts behind each annotation and how to properly apply them.

Top 5 Courses to Learn Hibernate in Depth by Javin Paul: In this post, we learn more about the top courses to learn Hibernate and the Java Persistence API, focusing on features like mapping, querying, and caching.

System Design

Top 20 System Design Interview Questions for Java Programmers by Javin Paul: Check out this post to prep for your next interview. We focus on the top 20 system design interview questions for Java programmers.

Top Microservices Interview Questions for 2019, Part 1 by Arnab Roy: A discussion of some of the most common interview questions developers and architects can expect to encounter when interviewing for a microservices role.

21 System Design and Object-Oriented Problems for Interviews by Javin Paul: Practice these frequently asked system design and object-oriented design problems and interview questions.

Additional Resources

Building Blocks of a Scalable Architecture by Daya V: Of course, you want your software in the hands of as many clients as possible, but first make sure that your product can handle all the extra weight.

Software Architecture: The 5 Patterns You Need to Know by Peter Morlion: Whether you're a software architect or a developer, it always pays to know the patterns used in a given architecture. Here are five of the most important ones.

Where Is My Cache? Architectural Patterns for Caching Microservices by Rafał Leszko: Where Is My Cache? Architectural Patterns for Caching Microservices — embedded, distributed, client-server, cloud.

Microservice Definition and Architecture by Ray Elenteny: This article walks through a set of patterns that leverage good engineering practices breaking down the development and deployment of microservices.


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