interface Switch{

    public void on();

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    public void off();

}

abstract class Printer{

    public abstract void print(); 

}

class ColorPrinter extends Printer implements Switch{

    public void on(){

  //......

}

    public void off(){

  //......

}

    public void print(){

  //......

}

}

public class Test(){

    public static void main(String[] args){

  Person Person=new Chinese();

  Printer print=new ColorPrinter();

  person.userPrinter(print);

  .......

}

}

 

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