Is it possible to write a regular expression to check if string is a number?
Explain the difference between abstraction and encapsulation.
What is meant by 'Class access modifiers'?
What are Inner classes?
Why volatile is used in java?
what is method reference in java 8?
What is gc()?
What is the difference between char and char *?
What is overriding in java?
What is tree node in java?
Difference between ‘is-a’ and ‘has-a’ relationship in java?
What is Hierarchy of exception?
What is garbage collector?