10 Most Asked Questions from Java Programmers

Java is one of the most widely used programming languages, powering everything from web apps to big business systems. If you're a Java programmer or learning Java, knowing the most commonly asked questions can be really helpful.

In this most-asked question from a Java programmer, we’ll go over key questions Java programmers often face, including topics like object-oriented programming, memory management, multithreading, and Java best practices. This guide will help you build your skills, prepare for interviews, and tackle Java projects with confidence.

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List of 10 Most Asked Questions from Java Programmer

1) Design discussion on elevator. Hint: Ask questions related to elevator functionality; come up with a High Level design and Low level design. Be prepared for scheduling questions related to elevator.

2) “n” points are given , find the number of quadruplets which form square.

3) Questions related to memory management in Java.

4) Mark and sweep algorithm and garbage collection in Java

5) Construct tree from Inorder and Preorder

6) Serialization in Java

7) How to ensure that instance is never garbage collected? Hint: We can use singleton pattern. There's a static reference to a singleton, so it won't be eligible for garbage collection until the classloader is eligible for garbage collection.

8) Questions related to classloader, rt.jar?

9) Difference between String, StringBuffer and StringBuilder?

10) Why String is immutable in Java? Note: Do discuss about security related issues in class loader.

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