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装饰者模式
1.装饰者模式就像打包一个快递
（1）主体：陶瓷，衣服。
（2）报纸填充，塑料泡沫，纸板，木板
2.Component
3.ConcreteComponent和Decorator
4.装饰者模式：动态的将新功能附加到对象上。在对象功能扩展方面，它比继承更有弹性。
5.有些递归的意思
类结构图
示例代码
package com.coffeebar.main;
public abstract class Drink {
public String description = "";
private float price = 0f;
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public abstract float cost();
}
package com.coffeebar.coffee;
import com.coffeebar.main.Drink;
public class Coffee extends Drink {
@Override
public float cost() {
// TODO Auto-generated method stub
return super.getPrice();
}
}
package com.coffeebar.coffee;
import com.coffeebar.main.Drink;
public class Decaf extends Coffee {
public Decaf() {
super.setDescription("Decaf");
super.setPrice(3.0f);
}
}
package com.coffeebar.coffee;
public class Espresso extends Coffee {
public Espresso() {
super.setDescription("Espresso");
super.setPrice(4.0f);
}
}
package com.coffeebar.coffee;
public class LongBlack extends Coffee {
public LongBlack() {
super.setDescription("LongBlack");
super.setPrice(5.5f);
}
}
package com.coffeebar.coffee;
public class ShortBlack extends Coffee {
public ShortBlack() {
super.setDescription("ShortBlack");
super.setPrice(6.0f);
}
}
package com.coffeebar.decorator;
import com.coffeebar.main.Drink;
public class Decorator extends Drink {
private Drink Obj;
public Decorator(Drink Obj) {
this.Obj = Obj;
}
@Override
public float cost() {
// TODO Auto-generated method stub
return super.getPrice() + Obj.cost();
}
public String Description() {
return super.description+"-"+super.getPrice()+"&&"+Obj.getDescription();
}
}
package com.coffeebar.decorator;
import com.coffeebar.main.Drink;
public class Chocolate extends Decorator {
public Chocolate(Drink Obj) {
super(Obj);
// TODO Auto-generated constructor stub
super.setDescription("Chocolate");
super.setPrice(3.0f);
}
}
package com.coffeebar.decorator;
import com.coffeebar.main.Drink;
public class Milk extends Decorator {
public Milk(Drink Obj) {
super(Obj);
// TODO Auto-generated constructor stub
super.setDescription("Milk");
super.setPrice(2.0f);
}
}
package com.coffeebar.decorator;
import com.coffeebar.main.Drink;
public class Soy extends Decorator {
public Soy(Drink Obj) {
super(Obj);
// TODO Auto-generated constructor stub
super.setDescription("Soy");
super.setPrice(1.5f);
}
}
package com.coffeebar.main;
import com.coffeebar.coffee.Decaf;
import com.coffeebar.coffee.LongBlack;
import com.coffeebar.decorator.Chocolate;
import com.coffeebar.decorator.Milk;
public class Coffeebar {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Drink order;
order = new Decaf();
System.out.println("order1 price: " + order.cost());
System.out.println("order1 desc: " +order.getDescription());
System.out.println("*******************");
order = new LongBlack();
order = new Milk(order);
order = new Chocolate(order);
order = new Chocolate(order);
System.out.println("order2 price: " + order.cost());
System.out.println("order2 desc: " + order.getDescription());
}
}
输出结果
order1 price: 3.0 order1 desc: Decaf ******************* order2 price: 13.5 order2 desc: Chocolate
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原文地址：http://www.cnblogs.com/chengzi123/p/4781926.html
