duck.java

一个java模式开发案例

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package duck;

/**
 *
 * @author ranran
 */
public  abstract class Duck {
    QuackBehavior quackbehavior;//为行为接口类型生命两个引用变量，所有鸭子子类（在一个package中）都继承它
    FlyBehavior flybehavior;
    public Duck(){

    }
    public void performquack(){
        quackbehavior.quack();//委托给行为类
    }
    public void performfly(){
        flybehavior.fly();//委托给行为类

    }
     public abstract void display();


     public void swim(){
         System.out.println("All ducks float,evan decoye!");
     }
     public void setFlyBehavior(FlyBehavior fb){
         flybehavior = fb;
     }
     public void setquackBehavior(QuackBehavior qb){
         quackbehavior = qb;
     }
    /**
     * @param args the command line arguments
     */
    //public static void main(String[] args) {
        // TODO code application logic here
    //}

}
//public class MallardDuck extends Duck{

//}