what is the difference between future and callable interface in java?
What does file separator do in java?
methods in Applet?
What is difference between compatible and incompatible changes in serialization?
Why heap memory is called heap?
How does arraylist work in java?
Is 'sizeof' a keyword?
What are classloaders?
What is the null?
Is a method a function?
What's the base class in java from which all classes are derived?
What is the advantage of functional interface in java 8?
Explain the difference between map and flatmap stream operation?