1) What is class?
2)What is the difference between default class and public class?
3)What is final class?
Q)What is abstract class ?
3) What is object ?
Q)Object class
Q)toString()
Q)Data Hiding
4)Types of objects?
5)What is singleton class?
6)What is hashcode?
7)Interfaces?
8)Abstract class?,
9)What is Abstraction?
10)What is encapsulation?
11)What is the difference between POJO class and Java Bean class?