package interview;

interface Implementor{

  void operationImpl();
}

abstract class Abstraction{
  protected Implementor implementor;

  public Abstraction(Implementor implementor){
    this.implementor = implementor;
  }

  public void operation(){
    implementor.operationImpl();
  }
}

class ConcreteImplementorA implements Implementor {
  @Override
  public void operationImpl() {
    System.out.println("具体实现A");
  }  
}

class ConcreteImplementorB implements Implementor {
  @Override
  public void operationImpl() {
    System.out.println("具体实现B");
  }  
}

class RefinedAbstraction extends Abstraction{

  public RefinedAbstraction(Implementor implementor) {
    super(implementor);
  }

  public void otherOperation(){
    System.out.println("其他操作");
  }
}

public class MainTest {

  public static void main(String arg[]) {
    Implementor implementor = new ConcreteImplementorA();
    RefinedAbstraction abstraction = new RefinedAbstraction(implementor);
    abstraction.operation();
    abstraction.otherOperation();
  }
}