策略模式

Author: enjoyCoding666

.idea/workspace.xml

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+package strategy;
+
+public class AdvancedMemberStrategy implements  MemberStrategy {
+    @Override
+    public double calcPrice(double booksPrice) {
+        System.out.println("高级会员的折扣为20%");
+        return booksPrice* 0.8;
+    }
+}

src/main/java/strategy/AdvancedMemberStrategy.java

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+package strategy;
+
+/**
+ * 策略模式。针对不同的客户，采用不同的算法
+ * 参考博客：http://www.cnblogs.com/java-my-life/archive/2012/05/10/2491891.html
+ */
+public class Client {
+    public static void main(String[] args) {
+        MemberStrategy strategy=new AdvancedMemberStrategy();
+        Price price=new Price(strategy);
+        double quote=price.quote(300);
+        System.out.println("该会员购买的图书经过计算价格为："+quote);
+
+    }
+}

src/main/java/strategy/Client.java

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+package strategy;
+
+public class IntermediateMemberStrategy implements  MemberStrategy {
+    @Override
+    public double calcPrice(double booksPrice) {
+        System.out.println("对于中级会员的折扣为10%");
+        return booksPrice* 0.9 ;
+    }
+}

src/main/java/strategy/IntermediateMemberStrategy.java

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+package strategy;
+
+/**
+ * 抽象折扣类
+ */
+public interface MemberStrategy {
+    public double calcPrice(double booksPrice);
+}

src/main/java/strategy/MemberStrategy.java

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+package strategy;
+
+public class Price {
+    private  MemberStrategy strategy;
+
+    /**
+     *
+     * @param strategy  具体的策略对象
+     */
+    public  Price(MemberStrategy strategy){
+        this.strategy=strategy;
+    }
+
+    /**
+     * 计算折扣后的价格。
+     * @param boosPrice
+     * @return
+     */
+    public double quote(double boosPrice){
+        return  this.strategy.calcPrice(boosPrice);
+    }
+
+}

src/main/java/strategy/Price.java

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+package strategy;
+
+public class PrimaryMemberStrategy implements  MemberStrategy {
+    @Override
+    public double calcPrice(double booksPrice) {
+        System.out.println("对于初级会员没有折扣");
+        return booksPrice;
+    }
+}