java _io_裝飾器涉及模式

//處理流:
/模擬咖啡
1、抽象組件:需要裝飾的抽象對象(接口或抽象父類)
2、具體組件:需要裝飾的對象
3、抽象裝飾類:包含了對抽象組件的引用及裝飾著共有的方法
4、具體裝飾類:被裝飾的對象
/

public class hel<E>{

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

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

    milk=new Milk(suger);  //裝飾
    System.out.println(milk.info()+"-->"+milk.cost());
}
}
//抽象組件
interface Drink{
    double cost();
    String info();
}
//具體組件
class Coffee implements Drink{
    private String name="原味咖啡";

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

}

//抽象裝飾類

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

}

//具體裝飾類
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";
}
}