Difference Between Interfaces and Abstract Classes

Both, interfaces and abstract classes are used to achieve abstraction in java. Still, there are significant differences between the two. Let’s see them

Interface	Abstract Class
The main purpose of interfaces is to achieve 100% abstraction.	The main purpose of abstract classes is to achieve partial abstraction.
We cannot create objects of an interface.	We cannot create objects of an abstract class also.
Interface cannot have variables. However, they can have constants.	Abstract classes can have both, variables as well as constants.
Interfaces can only have abstract methods. However, since java 8 interfaces can have default and static methods too.	Abstract classes can have a combination of any number (including 0) of abstract and non abstract methods.
Interfaces cannot have private methods and private constants.	Abstract classes can have private methods and data members.