Top 20 Java Interview Questions

Posted by Rajakumar N on February 20th, 2023

Here are Ten potential Java interview questions:

1. What is the difference between a HashMap and a TreeMap in Java? When would you use one over the other?
2. What is the use of the "synchronized" keyword in Java? Give an example.
3. What is the difference between an inner class and a nested class in Java? When would you use one over the other?
4. What is polymorphism in Java? How does it work?
5. What is the purpose of the "this" keyword in Java? Give an example.
6. What is the purpose of the "super" keyword in Java? Give an example.
7. What is the difference between a public, private, and protected access modifier in Java? When would you use one over the other?
8. What is the purpose of the "instanceof" operator in Java? Give an example.
9. What is the difference between a stack and a queue in Java? When would you use one over the other?
10. What is the use of the "transient" keyword in Java? Give an example.
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