java _io_装饰器涉及模式

//处理流:
/模拟咖啡
1、抽象组件:需要装饰的抽象对象(接口或抽象父类)
2、具体组件:需要装饰的对象
3、抽象装饰类:包含了对抽象组件的引用及装饰着共有的方法
4、具体装饰类:被装饰的对象
/

public class hel<E>{

public static void main(String[]args)
{
    Drink coffee =new Coffee();
    Drink suger =new Suger(coffee); //装饰

    System.out.println(suger.info()+"-->"+suger.cost());
    Drink milk =new Milk(coffee); //装饰
    System.out.println(milk.info()+"-->"+milk.cost());

    milk=new Milk(suger);  //装饰
    System.out.println(milk.info()+"-->"+milk.cost());
}
}
//抽象组件
interface Drink{
    double cost();
    String info();
}
//具体组件
class Coffee implements Drink{
    private String name="原味咖啡";

public double cost()
{
    return 10;
}
public String info()
{
    return name;
}

}

//抽象装饰类

abstract class Decorate implements Drink{
    //对抽象组件的引用
    private Drink drink;
    public Decorate(Drink drink) {
        this.drink=drink;
    }
    public double cost()
    {
        return this.drink.cost();
    }
    public String info() {
        return this.drink.info();   
    }

}

//具体装饰类
class Milk extends Decorate{

public Milk(Drink drink) {
    super(drink);
    // TODO Auto-generated constructor stub
}
public double cost()
{
    return super.cost()*4;
}
public String info() {
    return super.info()+"Milk";
}
}

class Suger extends Decorate{

public Suger(Drink drink) {
    super(drink);
    // TODO Auto-generated constructor stub
}
public double cost()
{
    return super.cost()*2;
}
public String info() {
    return super.info()+"Suger";
}
}