What is the difference between abstract class and interface ?

Sr.	Abstract Class	Interface
1	Abstract class can contain abstract methods, concrete methods or both	Interface contains only abstract methods
2	Except private we can have any access specifier for methods in abstract class.	Access Specifiers for methods in interface must be public
3	Except private variables can have any access specifiers	Variables defined must be public , static , final
4	We cannot achieve multiple inheritance using abstract class.	Multiple Inheritance in java is implemented using interface
5	An abstract class can be extended using keyword “extends”	To implement an interface we use implements keyword