How to Crack Java Interview? The Best Resources Narrowed Down

Hi, everyone! If you’re aiming for a Java developer interview(s) but are confused about how to prepare yourself for Java interviews, you’re in the right place. This brief guide can help you revise the most popular interview questions for beginners and experts, asked in small startups and large corporations.

Java Core Questions

Right off the bat, we want to mention that this guide starts with basic core Java questions and then progresses towards more advanced topics. “What to wait for?” is one of the main questions that jump into the mind of any applicant. Do note that Java interviews are typically different from traditional programming interviews. Java is an ocean of concepts, so be ready that Java interviews may cover a plethora of different questions. As a fresher guy, you may fave questions related to the Java fundamentals like Collections, String, hashcode, API, and OOPs. To be more precise, you’re likely to come across the following topics:

• Java Fundamentals
• Data Structure and Algorithms
• Object-Oriented Concepts
• Multithreading, concurrency, and thread basics
• Date type conversion and fundamentals
• Java Collections Framework
• Garbage Collection
• Array
• String
• SOLID design principles
• GOF Design Patterns
• Abstract class and interface
• Java basics e.g. equal and hashcode
• Generics and Enum
• Java IO and NIO
• Common Networking protocols
• Data structure and algorithm in Java
• Regular expressions
• JVM internals
• Java Best Practices
• JDBC
• Date, Time, and Calendar
• XML Processing in Java
• JUnit
• Programming questions

Also, please note that the questions may vary from one type of company to the other. For example, if you’re going to work with Java multi-threading-based apps, then you should put emphasis on core Java topics (multithreading and concurrency, Collections, Generics, GC Algorithms, JVM internals, and Enum). Want to tie your life with Java Web Service apps? Then a solid knowledge of REST, SOAP, XML, and JSON is a must. For Android developers, Android API is critical. All that just being said, Core Java is essential for any type of occupation. And the following guides can help you:

• Top 50 job interview questions and answers for Java Core. Part 1

• Top 50 job interview questions and answers for Java Core. Part 2

Questions about Algorithms in Java

After getting familiar with the aforementioned articles, you may be interested in questions regarding algorithms in Java. Data algorithm questions are a really important part of any programming language job interview, including Java interviews. Since data structures are core programming concepts, it's critical for all Java specialists to know basic data structures like the stack, linked list, queue, array, tree, and graph. And, naturally, any programming job interview would be incomplete without questions concerning data structures and algorithms. Also, you may get some Java exercises like swapping numbers without temp variable, questions like reversing a linked list/traversing a linked list/deleting nodes from the linked list. You can also be ready to expect questions about stack, queue, array, linked list, tree, graph, and hash table The following articles can help you out:

• The Q&A from job interviews: algorithms in Java, part 1

• The Q&A from job interviews: algorithms in Java, part 2

General Questions about Java

Besides the fundamental aspects like Core Java and Algorithms, there are still many other questions that you may expect. That’s why the following collection can come you in great handy:

• Exploring questions and answers from a job interview for a Java developer position. Part 1

• Exploring questions and answers from a job interview for a Java developer position. Part 2

• Exploring questions and answers from a job interview for a Java developer position. Part 3

• Exploring questions and answers from a job interview for a Java developer position. Part 4

• Exploring questions and answers from a job interview for a Java developer position. Part 5

• Exploring questions and answers from a job interview for a Java developer position. Part 6

• Exploring questions and answers from a job interview for a Java developer position. Part 7

• Exploring questions and answers from a job interview for a Java developer position. Part 8

• Exploring questions and answers from a job interview for a Java developer position. Part 9

• Exploring questions and answers from a job interview for a Java developer position. Part 10

• Exploring questions and answers from a job interview for a Java developer position. Part 11

• Exploring questions and answers from a job interview for a Java developer position. Part 12

Bonus Tips

Java-related questions are just half the battle won. Many recruiters pay a significant part to tough interview questions to test your general skills and ability to work in a team. So, if you don’t want your potential employers to catch you unawares, reading the following articles can save your professional life. They can help you learn the answers to some of the trickiest questions found in the Java interviews, as well as discover some additional sources that can help you get armed with the knowledge to the fullest:

• Tricky Java questions frequently asked at interviews

• Java Junior Interview Prep. Best Websites With Questions, Videos and Mock Interviews

In the end, we would like to stress that it’s quite normal to get rejected after your first interviews. Just give yourself a pat on the back and analyze each of your previous interviews to get more chances to land your dream job after the future ones. With new interviews, you're just getting closer to the best post ever!