Difference between abstract class and interface

Difference between abstract class and interface

Difference between abstract class and interface :

Abstract class	Interface
1.Abstract class contains constants, variables, constructors, concrete methods and abstract methods.	1.Interface contains constants and public abstract methods.
2.Use extends keyword to extend the abstract class.	2.Use 'implements' keyword to implement the interface.
3.Abstract class doesn't support multiple inheritance i.e. after extends keyword more than one class name is not allowed.	3.Interface supports multiple inheritances i.e. after implements keyword more than one class name is allowed.
4.When you are writing abstract methods in abstract class we should write abstract keyword.	4.When you are writing abstract methods in interface, no need to write abstract keyword.
5.If you want to declare final static variable and public abstract methods in abstract class, we should declare them explicitly.	5.By default all the variables are final and static and all the methods are public and abstract.