java设计模式之策略模式

  1 public class MiniDuckSimulator 
  2 {
  3     public static void main(String[] args) 
  4     {
  5         //绿头鸭
  6         Duck mallard = new MallardDuck();
  7         mallard.performQuack();
  8         mallard.performFly();
  9 
 10         System.out.println("----------------");
 11 
 12 
 13         //模型鸭
 14         Duck model = new ModelDuck();
 15         model.performFly();
 16         model.setFlyBehavior(new FlyRocketPowered());
 17         model.performFly();
 18     }
 19 }
 20 //鸭子抽象类
 21 abstract class Duck{
 22     FlyBehavior flyBehavior;
 23     QuackBehavior quackBehavior;
 24     public Duck() {
 25 
 26 
 27     }
 28 
 29     public abstract void display();
 30     //还有更多
 31     
 32     public void performFly() {
 33         flyBehavior.fly();
 34     }
 35 
 36     public void performQuack() {
 37         quackBehavior.quack();
 38     }
 39 
 40     public void swim() {
 41         System.out.println("All ducks float, even decoys!");
 42     }
 43 
 44     public void setFlyBehavior(FlyBehavior fb) {
 45         flyBehavior = fb;
 46     }
 47 
 48     public void setQuackBehavior(QuackBehavior qb) {
 49         quackBehavior = qb;
 50     } 
 51 }
 52 //飞行行为
 53 interface FlyBehavior {
 54     public void fly();
 55 }
 56 //用翅膀飞
 57 class FlyWithWings implements FlyBehavior {
 58     public void fly() {
 59         System.out.println("I‘m flying!!");
 60     }
 61 }
 62 //不会飞
 63 class FlyNoWay implements FlyBehavior {
 64     public void fly() {
 65         System.out.println("I can‘t fly.");
 66     }
 67 }
 68 //以火箭为动力
 69 class FlyRocketPowered implements FlyBehavior {
 70     public void fly() {
 71         System.out.println("I‘m flying with a rocket!");
 72     }
 73 }
 74 
 75 //叫行为
 76 interface QuackBehavior {
 77     public void quack();
 78 }
 79 //
 80 class Quack implements QuackBehavior {
 81     public void quack(){
 82         System.out.println("Quack");
 83     }
 84 }
 85 //不会叫
 86 class MuteQuack implements QuackBehavior {
 87     public void quack() {
 88         System.out.println("<< Silence >>");
 89     }
 90 }
 91 //
 92 class Squeak implements QuackBehavior {
 93     public void quack() {
 94         System.out.println("Squeak");
 95     }
 96 }
 97 //绿头鸭
 98 class MallardDuck extends Duck {
 99     public MallardDuck() {
100         quackBehavior = new Quack();
101         flyBehavior = new FlyWithWings();
102     }
103 
104     public void display() {
105         System.out.println("I‘m a real Mallad duck");
106     }
107 }
108 
109 //模型鸭
110 class ModelDuck extends Duck {
111     public ModelDuck() {
112         flyBehavior = new FlyNoWay();
113         quackBehavior = new Quack();
114     }
115 
116     public void display() {
117         System.out.println("I‘m a model duck");
118     }
119 }