Java策略模式.doc

对Java 策略模式的理解主要是通过一个实例来理解：封装商场鞋子的打折策略。分析：商场鞋子打折活动，我们简单概括为双休打折和节日打折（其他特定日打折自己写）。双休打折和节日打折这2类打折活动的具体规则一般都不会一样，通过封装打折策略，来增强程序的可扩展性。也就是说，下次商场有其他的打折策略时，只需添加一个该打折策略的类即可，实现对原来代码修改量最少，符合开闭的原则。代码：1. Shoe.java文件:public class Shoe implements IShopCutprivate double value;public Shoe(double value) this.value = value;public double getValue() return value;public void setValue(double cutprice) this.value = cutprice;Overridepublic double shopCut() return new FestivalCut().cut(this);2. IShopCut.java文件public interface IShopCut double shopCut();3. 双休日打折WeekendCut.java文件：public class WeekendCut private double cutprice;public double getCutprice() return cutprice;public double cut(Shoe s)if(s.getValue() 300 ) cutprice = s.getValue()*80/100;else if (s.getValue() 200 ) cutprice = s.getValue()*85/100;else if (s.getValue() 150 ) cutprice = s.getValue()*95/100;else cutprice = s.getValue();s.setValue(cutprice);return cutprice;4. 节日打折FestivalCut.java文件：public class FestivalCut private double cutprice;public double getCutprice() return cutprice;public double cut(Shoe s)if(s.getValue() 1000 ) cutprice = s.getValue()*60/100;else if (s.getValue() 500 ) cutprice = s.getValue()*85/100;else if (s.getValue() 300 ) cutprice = s.getValue()*95/100;else cutprice = s.getValue();s.setValue(cutprice);return cutprice;5. 客户端测试代码Test.java文件：public class Test public static void main(String args) double price = 360;System.out.println(打折前的价格： + price);Shoe sh = new Shoe(price);price = sh.shopCut();System.out.println(打折后的价格： + price);注：整个程序修改部分只是在Shoe.java文件中