Java Object-Oriented _ interface

Java interface

Interface, is an abstract type, is a collection of abstract methods, interfaces are usually declared by interface. A class inherits the abstract method of an interface by inheriting the interface.

Interfaces are not classes, and the way they are written is similar to classes, but they are different concepts. Class describes the properties and methods of an object. The interface contains the methods to be implemented by the class.

Unless the class that implements the interface is an abstract class, the class defines all the methods in the interface.

Interfaces are similar to classes:

• An interface can have multiple methods.
• The interface file is saved in a file that ends in. java, and the filename uses the interface name.
• The bytecode file for the interface is saved in a file that ends in a. class.
• The corresponding bytecode file for the interface must be in the directory structure that matches the package name.

The interface keyword is used to declare an interface. Here is a simple example of an interface declaration.

/* File name: Nameofinterface.java */import java.  Lang. *;  Introduce package publicinterfacenameofinterface{//any type final, static field //abstract method }  

Java Object-Oriented _ interface