Difference Between Interface And Abstract Class

Difference between interface and abstract class.

1.Abstract classes can have implementations for some of its

members (Methods), but the inteface class can't have

implementation for any of its members.

2.Abstract class defines few or none of the methods, but

interface defines all the methods.

3 Abstract classes should have subclasses else that will

be useless.

4.Interfaces must have implementations by other classes else

that will be useless.

5.Only an interface can extend another interface, but any

class can extend an abstract class.

6.All variable in interfaces are final by default.

7.Accessibility modifier(Public/Private/internal) is

allowed for abstract class.Interface doesn't allow accessibility modifier