Extending multiple interfaces

An interface can extend multiple interfaces, let’s try:

interface MyMaster1 {

      void showMaster1();

}

interface MyMaster2

{

      void showMaster2();

}

interface MyMaster3 extends MyMaster1, MyMaster2

{

      void showMaster3();

}

public class MyImpl implements MyMaster3

{

      public static void main(String args[])

      {

            MyMaster1 m1 = new MyImpl();

            m1.showMaster1();

            //m1.showMaster2();     Error

            //m1.showMaster3();     Error

           

            MyMaster2 m2 = new MyImpl();

            m2.showMaster2();

           

            MyMaster3 m3 = new MyImpl();

            m3.showMaster3();

           

      }

      @Override

      public void showMaster1() {

            System.out.println("Master 1 executed"); 

      }

      @Override

      public void showMaster2()

      {

            System.out.println("Master 2 executed");

      }

      @Override

      public void showMaster3()

      {

            System.out.println("Master 3 executed");

      }

}

Output:

Master 1 executed

Master 2 executed

Master 3 executed