//=========1111111惠普印表機===================

class hpprinter extends fulei{

}

//===2222222主類===========

class test(){

 public static void main(string args[]){

 int flag=0;
 if(flag==0){
 hpprinter hp=new hpprinter();
 hpprinter.open();
 hpprinter.print();
 hpprinter.close();

 }
 else if(flag
 
==1){
 CannonPrinter can=new CannonPrinter();
 CannonPrinter.open();
 CannonPrinter.print();
 CannonPrinter.close();
 }
}

//=====33333333 佳能印表機==========

class CannonPrinter extends fulei{
  void close(){
   this.clean();
   super.close();
  }
    void clean(){
    System.out.print(clean);
    }
  }
 

//========4444父類=========

class fulei{
 void open(){
 System.out.println("open");
 }
 void close(){
 System.out.println("close");
 }
 void print(){
 System.out.println("print");
 }

  }