decoractor装饰模式

最新推荐文章于 2024-02-03 15:25:32 发布

china_wanglong

最新推荐文章于 2024-02-03 15:25:32 发布

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CC 4.0 BY-SA版权

分类专栏：设计模式文章标签： string class

本文链接：https://blog.youkuaiyun.com/china_wanglong/article/details/8057598

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本文介绍了一种使用Java实现的装饰者模式案例，该模式允许在不改变原有对象的前提下为其添加新的功能。通过具体示例展示了如何为饮料添加不同的配料，并计算最终价格。

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动态的给一个对象添加一些额外的功能

示例代码：

package com.dector;

public class Main {
	public static void main(String[] args) {
		Beverage b1 =new Soy(new Milk(new HouseBlend()));
		System.out.println(b1.getDescription()+":"+b1.cost());
		Beverage b2 = new Soy(new Mocha(new Milk(new HouseBlend())));
		System.out.println(b2.getDescription()+":"+b2.cost());
	}

}

package com.dector;

public abstract class Beverage {
	String description = "unknow";
	public String getDescription()
	{
		return this.description;
	}
	public abstract double cost();
}

class HouseBlend extends Beverage{
	public String getDescription()
	{
		return "HouseBlend";
	}
	@Override
	public double cost() {
		// TODO Auto-generated method stub
		return 1.0;
	}
}

class DarkRoast extends Beverage{
	public String getDescription()
	{
		return "DarkRoast";
	}
	@Override
	public double cost() {
		// TODO Auto-generated method stub
		return 2.0;
	}
}

abstract class CondimentDecorator extends Beverage{
	Beverage bev;
}

class Milk extends CondimentDecorator{
	private double money = 3.0;
	public String getDescription()
	{
		return "MIlk "+ bev.getDescription();
	}
	public Milk(Beverage b){
		this.bev = b;
	}
	@Override
	public double cost() {
		// TODO Auto-generated method stub
		return this.money + bev.cost();
	}
}

class Mocha extends CondimentDecorator{
	private double money = 4.0;
	public String getDescription()
	{
		return "Mocha "+ bev.getDescription();
	}
	public Mocha(Beverage b){
		this.bev = b;
	}
	@Override
	public double cost() {
		// TODO Auto-generated method stub
		return this.money + bev.cost();
	}
}

class Soy extends CondimentDecorator{
	private double money = 5.0;
	public String getDescription()
	{
		return "Soy "+ bev.getDescription();
	}
	public Soy(Beverage b){
		this.bev = b;
	}
	@Override
	public double cost() {
		// TODO Auto-generated method stub
		return this.money + bev.cost();
	}
}