設計模式-裝飾者模式

1、設計模式－裝飾者模式,,,假設一個飲料店抽象一個飲料類,,但是，就某種飲料來說可以要求在其中加入各種調料例如：奶，巧克力，糖等加入不同的調料，會形成不同名稱的飲料這樣飲料的數(shù)量將會很多，即繼承于飲料父類的子類將會很多每個子類的cost（）方法將計算出特定飲料加上調料的價錢,,這會造成維護的噩夢如果奶的價錢上漲如果新增一種調料,,現(xiàn)在要以飲料為主體運行時以調料來“裝飾”（decorate）飲料,,,定義裝飾者模式,,pu

2、blic class DarkRoast extends Beverage {public DarkRoast() {description = "Dark Roast Coffee";} public double cost() {return .99;}},,public class Mocha extends CondimentDecorator {Beverage beve

3、rage; public Mocha(Beverage beverage) {this.beverage = beverage;} public String getDescription() {return beverage.getDescription() + ", Mocha";} public double cost() {return .20 + beverage

4、.cost();}},public class StarbuzzCoffee { public static void main(String args[]) {Beverage beverage = new Espresso();System.out.println(beverage.getDescription() + " $" + beverage.cost()); B

5、everage beverage2 = new DarkRoast();beverage2 = new Mocha(beverage2);beverage2 = new Mocha(beverage2);beverage2 = new Whip(beverage2);System.out.println(beverage2.getDescription() + " $" + beve

6、rage2.cost()); Beverage beverage3 = new HouseBlend();beverage3 = new Soy(beverage3);beverage3 = new Mocha(beverage3);beverage3 = new Whip(beverage3);System.out.println(beverage3.getDescription() + &q