What is difference between interface and abstract class?

Question

Accepted Answer

Interface defines only method signatures while abstract class can have method implementations.

An interface can be implemented by multiple classes while a class can extend only one abstract class.
An abstract class can have instance variables while an interface cannot.
An abstract class can have constructors while an interface cannot.
An abstract class can provide default implementations for some methods while an interface cannot.
Example: An interface for a shape can have a method signature for calculating area while an abstract class for a shape can have a method implementation for calculating perimeter.

Accepted Answer

The one major diffrence between both class are abstract has all the modifiers like public private static but interface is only public and we can't use other access modifiers

What is difference between interface and abstract class?

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