What is the use of join method?
What is collections framework?
What is the tradeoff between using an unordered array versus an ordered array?
Is there memory leaks in java?
Explain the hierarchy of java exception classes?
What is immutability in java?
How is abstraction implemented in java ?
What is an off by one error in java?
What is the benefit of inner / nested classes ?
What are the types of inner classes (non-static nested class) used in java?
How do you generate random numbers in java?
How can you eliminate duplicates?
What classes of exceptions, thrown by a throw statement?