Abstract Class and Interface

What is the difference between abstract class and interface?

Abstract Class-

• Abstract classes can have implementation for some of its members.
• Abstract classes can have fields as its members.
• Abstract class can inherit from another abstract class or interface.
• Multiple inheritance is not possible in case of abstract class.

Interfaces-

• Interfaces cannot have implementation for any of its members.
• Interfaces cannot have fields as its members.
• Interface can only inherit from another interface and not a class.
• Multiple inheritance is possible in case of interfaces.