Скачать или смотреть Java Tutorials: Interfaces in Java | Implementation | When to use Interface

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.

Do watch video for more info:

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