interface calculate {
                   void cal(int item);
               }
           class displayA implements calculate {
                   int x;
                   public void cal(int item) {
                       x = item * item;            
                   }
               }
          class displayB implements calculate {
               int x;
               public void cal(int item) {
                   x = item / item;            
               }
           }
 
          class interfaces {
               public static void main(String args[]) {
                   displayA arr1 = new displayA();
                   displayB arr2 = new displayB();
                   arr1.x = 0;  arr2.x = 0;      
                   arr1.cal(2); arr2.cal(2);
                   System.out.print(arr1.x + " " + arr2.x);
               }
           }

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