设计模式（java版）——行为型——策略模式

项目源码已提交github：https://github.com/ckl001/designPattem_java

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:38
 * @Des 促销策略
 **/
public interface PromotionStrategy {
    void doPromotion();
}

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:38
 * @Des 促销活动
 **/
public class PromotionActivity {
    private PromotionStrategy promotionStrategy;

    public PromotionActivity(PromotionStrategy promotionStrategy) {
        this.promotionStrategy = promotionStrategy;
    }

    public void executePromotionStrategy(){
        promotionStrategy.doPromotion();
    }
}

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:43
 * @Des 无促销活动
 **/
public class EmptyPromotionStrategy implements PromotionStrategy{
    @Override
    public void doPromotion() {
        System.out.println("无促销活动");
    }
}

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:44
 * @Des 返现促销
 **/
public class FanXianPromotionStrategy implements PromotionStrategy{
    @Override
    public void doPromotion() {
        System.out.println("返现促销,返回的金额存放到慕课网用户的余额中");
    }
}

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:45
 * @Des 立减促销
 **/
public class LiJianPromotionStrategy implements PromotionStrategy{
    @Override
    public void doPromotion() {
        System.out.println("立减促销,课程的价格直接减去配置的价格");
    }
}

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:46
 * @Des 满减促销
 **/
public class ManJianPromotionStrategy implements PromotionStrategy{
    @Override
    public void doPromotion() {
        System.out.println("满减促销,满200-20元");
    }
}

package com.Ljava.design.pattem.behavioral.strategy;

import java.util.HashMap;
import java.util.Map;

/**
 * @Auther 20173
 * @Date 2019-4-15 11:46
 * @Des 促销策略工厂
 **/
public class PromotionStrategyFactory {
    private static Map PROMOTION_STRATEGY_MAP = new HashMap();
    static{
        PROMOTION_STRATEGY_MAP.put(PromotionKey.LIJIAN,new LiJianPromotionStrategy());
        PROMOTION_STRATEGY_MAP.put(PromotionKey.FANXIAN,new FanXianPromotionStrategy());
        PROMOTION_STRATEGY_MAP.put(PromotionKey.MANJIAN,new ManJianPromotionStrategy());
    }
    private interface PromotionKey{
        String LIJIAN = "LIJIAN";
        String FANXIAN = "FANXIAN";
        String MANJIAN = "MANJIAN";
    }

    private static final PromotionStrategy NON_PROMOTION = new EmptyPromotionStrategy();

    public PromotionStrategyFactory() {
    }

    public static PromotionStrategy getPromotionStrategy(String promotionKey){
        PromotionStrategy promotionStrategy = PROMOTION_STRATEGY_MAP.get(promotionKey);
        return promotionStrategy == null ? NON_PROMOTION : promotionStrategy;
    }


}

package com.Ljava.design.pattem.behavioral.strategy;

/**
 * @Auther 20173
 * @Date 2019-4-15 12:00
 * @Des TODO
 **/
public class Test {

    public static void main(String[] args) {
        PromotionActivity promotionActivity618 = new PromotionActivity(new LiJianPromotionStrategy());
        PromotionActivity promotionActivity1111 = new PromotionActivity(new FanXianPromotionStrategy());

        promotionActivity618.executePromotionStrategy();
        promotionActivity1111.executePromotionStrategy();
    }
}