Java Tutorials: Interfaces in Java | Implementation | When to use Interface

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Interface:
When to use Interface:
- If there's classes, which'll implement functionality differently, use interface.

- Interfaces are like utility, which can be implemented any class.

- interface is incomplete, so you can not create object of it, but we can create object of the classes, which are implementing method of interface.

- all method are by default public, static & abstract

- all variable are by default public, static, final

- Classes which'll implement interface need to implement all methods.

- Generally interfaces are created, so even non related class can implement it, but abstract class is created for related classes.

- interface can extends another interface

- A class can implements multiple interfaces, but extends only single classes

- A class can implements two interface which have same name & argument method

- A class can implement multiple interface & extend another class at same time

- It support run time polymorphism means method will execute as per object call.

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