import  java.util.*;

 class  Test {
     public   static   class  IntWrapper  implements  Comparable {
         public   int  data =  0 ;
        IntWrapper( int  data) {
             this .data = data;
        }

         public   boolean  equals(Object obj) {
             if (obj  instanceof  IntWrapper) {
                 return  ((IntWrapper)obj).data ==  this .data;
            }  else   return  false;            
        }

         public  String toString() {
             return  Integer.toString(data);
        }


         public   int  compareTo(Object o){
             if (o  instanceof  IntWrapper) {
                 return   this .data - ((IntWrapper)o).data;
            }  else  {
                 return   0 ;
            }
        }

    }
    
     public   static   void  main(String[] args) {
        Set<IntWrapper> set1 =  new  LinkedHashSet<IntWrapper>();
        Set<IntWrapper> set2 =  new  LinkedHashSet<IntWrapper>();
        set1.add( new  IntWrapper( 1 ));
        set1.add( new  IntWrapper( 2 ));
        set1.add( new  IntWrapper( 3 ));
        set2.add( new  IntWrapper( 2 ));
        
        set1.removeAll(set2);
        System.out.println(set1);
    }
}