S4P1

Write a program that illustrates interface inheritance. Interface P is extended by P1 And P2. Interface P12 inherits from both P1 and P2.Each interface declares one constant and one method. Class Q implements P12.Instantiate Q and invokes each of its methods. Each method displays one of the constants.

Code:

 interface p   
 {  
      int p=0;  
      void display_p();  
 }  
 interface p1 extends p  
 {  
      int p1=1;  
      void display_p1();  
 }  
 interface p2 extends p  
 {  
      int p2=2;  
      void display_p2();  
 }  
 interface p12 extends p1,p2  
 {  
      int p12=12;  
      void display_p12();  
 }  
 class Q implements p12  
 {  
      int q=3;  
      public void display_p()  
      {  
           System.out.println("\nInterface P, Constant in P: "+p);  
      }  
      public void display_p1()  
      {  
           System.out.println("Interface P1 Extends P, Constant in P1: "+p1);  
      }  
      public void display_p2()  
      {  
           System.out.println("Interface P2 Extends P, Constant in P2: "+p2);  
      }  
      public void display_p12()  
      {  
           System.out.println("Interface P12 Extends P1 & P2, Constant in P12: "+p12);  
      }  
      void display_q()  
      {  
           System.out.println("Class Q Implements P12, Constant in Q: "+q);  
      }  
 }  
 class S4P1_Interface  
 {  
      public static void main(String args[])  
      {  
           Q object = new Q();  
           object.display_p();  
           object.display_p1();  
           object.display_p2();  
           object.display_p12();  
           object.display_q();            
      }  
 }  

Output: