Interface in Java

• In real world, Interface is nothing but thing which acts as connection between two objects.

         For example,

                Power button acts as an interface between Human and Computer.

• In Java,Interface is created by using the keyword interface.
• The interface name can be start with letter I, which is used to identify that the particular block is an Interface.
• In interface, we can only declare variables and methods.
• The initerface is implemented in a class by using the keyword implements (Refer Syntax)
• The variables declared in interface are by default "public and final" .
• The definition part of the method should lies in the class that implements the particular interface and the method should be declared as public.
• A class can implement any number of interfaces and it is used to achieve multiple inheritance in java.

Syntax:

           interface Interfacename

           {

               

                //Variable and Method declaration

            }

           class Classname implements Interfacename

          {

               //Definition for methods in Interface

           }