java 装饰者模式很详细！

最新推荐文章于 2023-06-21 20:12:47 发布

转载最新推荐文章于 2023-06-21 20:12:47 发布 · 613 阅读

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本文通过一个具体的例子详细介绍了装饰者模式的设计与实现过程。通过定义不同的装饰类来为原始对象添加新的职责，而不改变其原有结构。展示了如何利用装饰者模式进行功能扩展，并提供了完整的Java代码实现。

转载自：http://blog.youkuaiyun.com/jason0539/article/details/22713711
http://blog.youkuaiyun.com/jason0539（转载请说明出处）

“`
//定义被装饰者
public interface Human {
public void wearClothes();

public void walkToWhere();

}

//定义装饰者
public abstract class Decorator implements Human {
private Human human;

public Decorator(Human human) {  
    this.human = human;  
}  

public void wearClothes() {  
    human.wearClothes();  
}  

public void walkToWhere() {  
    human.walkToWhere();  
}

}

//下面定义三种装饰，这是第一个，第二个第三个功能依次细化，即装饰者的功能越来越多
public class Decorator_zero extends Decorator {

public Decorator_zero(Human human) {  
    super(human);  
}  

public void goHome() {  
    System.out.println("进房子。。");  
}  

public void findMap() {  
    System.out.println("书房找找Map。。");  
}  

@Override  
public void wearClothes() {  
    // TODO Auto-generated method stub  
    super.wearClothes();  
    goHome();  
}  

@Override  
public void walkToWhere() {  
    // TODO Auto-generated method stub  
    super.walkToWhere();  
    findMap();  
}

}

public class Decorator_first extends Decorator {

public Decorator_first(Human human) {  
    super(human);  
}  

public void goClothespress() {  
    System.out.println("去衣柜找找看。。");  
}  

public void findPlaceOnMap() {  
    System.out.println("在Map上找找。。");  
}  

@Override  
public void wearClothes() {  
    // TODO Auto-generated method stub  
    super.wearClothes();  
    goClothespress();  
}  

@Override  
public void walkToWhere() {  
    // TODO Auto-generated method stub  
    super.walkToWhere();  
    findPlaceOnMap();  
}

}

public class Decorator_two extends Decorator {

public Decorator_two(Human human) {  
    super(human);  
}  

public void findClothes() {  
    System.out.println("找到一件D&G。。");  
}  

public void findTheTarget() {  
    System.out.println("在Map上找到神秘花园和城堡。。");  
}  

@Override  
public void wearClothes() {  
    // TODO Auto-generated method stub  
    super.wearClothes();  
    findClothes();  
}  

@Override  
public void walkToWhere() {  
    // TODO Auto-generated method stub  
    super.walkToWhere();  
    findTheTarget();  
}

}

//定义被装饰者，被装饰者初始状态有些自己的装饰
public class Person implements Human {

@Override  
public void wearClothes() {  
    // TODO Auto-generated method stub  
    System.out.println("穿什么呢。。");  
}  

@Override  
public void walkToWhere() {  
    // TODO Auto-generated method stub  
    System.out.println("去哪里呢。。");  
}

}
//测试类，看一下你就会发现，跟java的I/O操作有多么相似
public class Test {
public static void main(String[] args) {
Human person = new Person();
Decorator decorator = new Decorator_two(new Decorator_first(
new Decorator_zero(person)));
decorator.wearClothes();
decorator.walkToWhere();
}
}
“` 这里写图片描述