设计模式-装饰者模式

package com.shi.design.director;

/**
 * 装饰者模式
 * @author shiye
 *
 */
public abstract class Drink {
	
	private String desc;//描述
	
	private float price;//价格

	public String getDesc() {
		return desc;
	}

	public void setDesc(String desc) {
		this.desc = desc;
	}

	public float getPrice() {
		return price;
	}

	public void setPrice(float price) {
		this.price = price;
	}
	
	//计算费用 （需要子类去实现）
	public abstract float cost();
	
}

package com.shi.design.director;

/**
 * 所有咖啡的父类  ， 对咖啡的所有子类进行对的封装
 * @author shiye
 *
 */
public abstract class Coffer extends Drink{

	@Override
	public float cost() {
		System.out.println(super.getDesc() + " 的价格为= " + super.getPrice());
		return super.getPrice();
	}

}

package com.shi.design.director;

/**
 * 第一种咖啡 
 * @author shiye
 *
 */
public class CofferSun1 extends Coffer {
	
	public CofferSun1() {
		setDesc(" 第一种咖啡 ");
		setPrice(5.0f);
	}
}

package com.shi.design.director;

/**
 * 第二种咖啡
 * @author shiye
 *
 */
public class CofferSun2 extends Coffer {
	
	public CofferSun2() {
		setDesc(" 第二种咖啡 ");
		setPrice(8.0f);
	}
}

package com.shi.design.director;

/**
 * 第三种咖啡
 * @author shiye
 *
 */
public class CofferSun3 extends Coffer {
	
	public CofferSun3() {
		setDesc(" 第三种咖啡 ");
		setPrice(30.0f);
	}
}

package com.shi.design.director;

/**
 * 装饰者
 * @author shiye
 *
 */
public abstract class Decorator extends Drink {
	
	private Drink drink;

	@Override
	public float cost() {
		// 计算价格 (咖啡的价格 + 调料的价格)
		return drink.getPrice() + super.getPrice();
	}
	
	@Override
	public String getDesc() {
		// 描述
		return super.getDesc() + "的价格为： " + super.getPrice() + drink.getDesc();
	}

	public Drink getDrink() {
		return drink;
	}

	public void setDrink(Drink drink) {
		this.drink = drink;
	}

}

package com.shi.design.director;

/**
 * 巧克力 装饰者
 * @author shiye
 *
 */
public class DecoratorChoclate extends Decorator {
	
	public DecoratorChoclate(Drink drink){
		setDrink(drink);
		setDesc(" 巧克力 ");
		setPrice(9.5f);
	}
}

package com.shi.design.director;

/**
 * 牛奶装饰者
 * @author shiye
 *
 */
public class DecoratorMilk extends Decorator {
	
	public DecoratorMilk(Drink drink){
		setDrink(drink);
		setDesc(" 牛奶 ");
		setPrice(3.0f);
	}
}

package com.shi.design.director;

/**
 * 豆浆装饰者
 * @author shiye
 *
 */
public class DecoratorSoy extends Decorator {
	
	public DecoratorSoy(Drink drink){
		setDrink(drink);
		setDesc(" 豆浆 ");
		setPrice(1.5f);
	}
}

package com.shi.design.director;

/**
 * 装饰者模式测试
 * @author shiye
 *
 */
public class Test {

	public static void main(String[] args) {
		Drink order = new CofferSun2();
		System.out.println(" 一份" + order.getDesc() + "咖啡的总价格为： " + order.cost());
		
		order = new DecoratorChoclate(order);
		System.out.println(" 加了一份" + order.getDesc() + "咖啡的总价格为： " + order.cost());
		
		order = new DecoratorMilk(order);
		System.out.println(" 加了一份" + order.getDesc() + "咖啡的总价格为： " + order.cost());
	}

}