1 interface I 2 { 3 public void m(); 4 } 5 6 abstract class A implements I 7 { 8 // But doesn't define m() 9 } 10 11 public class pr8823 extends A // which means it implements I 12 { 13 public static void main(String[] args) 14 { 15 // Defining c as either I or C will work. 16 A c = new pr8823(); 17 c.m(); 18 } 19 20 public void m() 21 { 22 System.out.println("Hello World!"); 23 } 24 } 25