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";
}
}