Coders Packet

Interface in Java

By Aryan Pradhan

  • Interface.java

    • In this tutorial we will learn about the concept of Interface in java. We learn about interface through a simple code.

    What is Interface?

    The interface. is a blueprint of classes. An interface is a method to achieve 100% abstraction and multiple inheritance. An interface can have methods and variables only. An interface can have only abstract methods, not the body of the method. An interface specifies what a class must do and not what to do. Since java does not support multiple inheritance we can achieve it through the interface.The interface represents the IS-A relationship.

    Syntax:

    1. interface  interface_name{  
    2.       
    3.     // declare constant fields  
    4.     // declare methods that abstract   
    5.     // by default.  
    6. }  

    Use of Interface

    1. By using the interface we can achieve multiple inheritance.

    2. Interface is used to achieve 100% abstraction.

    3. It can also be used to achieve loose coupling.

     

    Code

    interface shape{


    void draw();


    }


    class rectangle implements shape{


    public void draw(){


    System.out.println("Drawing Rectangle");


    }
    }
    class square implements shape{


    public void draw(){


    System.out.println("Drawing Square");


    }
    }


    class sample{


    public static void main(String args []){


    shape s=new square();


    s.draw();
    }
    }

     

    Output:

    Drawing Square

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