Explain the difference between abstract class and interface in java?
Can we sort hashset in java?
Can we call virtual funciton in a constructor ?
Why are arrays useful in java?
Explain the use of sublass in a java program?
Explain about automatic type conversion in java?
how to create multithreaded program? Explain different ways of using thread? When a thread is created and started, what is its initial state? Or extending thread class or implementing runnable interface. Which is better? : Java thread
Name few "optional" classes introduced with java 8 ?
Can an interface have a class?
What do you mean by access modifier?
What is Mutex (Mutual Exclusion Object) ?
How do you trim a space in java?
Is set thread safe java?
what is mutual exclusion? How can you take care of mutual exclusion using java threads? : Java thread
What is a singleton class? Give a practical example of its usage.