【设计模式学习笔记】策略模式

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In computer programming, the strategy pattern (also known as the policy pattern) is a behavioral software design pattern that enables selecting an algorithm at runtime. [wiki]

1.1 接口

package strategy;

/************************************************
 *@ClassName : CreateCar
 *@Description : TODO
 *@Author : NikolaZhang
 *@Date : 【2018/11/28 21:05】
 *@Version : 1.0.0
 *************************************************/

public interface CreateCarI {
    void doingSomething();
}

1.2 实现类（举一个例子）

package strategy;

/************************************************
 *@ClassName : BuyMetal
 *@Description : TODO
 *@Author : NikolaZhang
 *@Date : 【2018/11/28 21:09】
 *@Version : 1.0.0
 *************************************************/

public class BuyMetalImpl implements CreateCarI {

    @Override
    public void doingSomething() {
        System.out.println("购买金属材料。");
    }
}

1.3 入口类

package strategy;

import com.sun.org.omg.SendingContext.CodeBaseHelper;

/************************************************
 *@ClassName : StartWork
 *@Description : TODO
 *@Author : NikolaZhang
 *@Date : 【2018/11/28 21:14】
 *@Version : 1.0.0
 *************************************************/

public class StartWork {
    private CreateCarI createCarI;

    public StartWork(CreateCarI createCarI){
        this.createCarI = createCarI;
    }

    public void start(){
        createCarI.doingSomething();
    }
}

1.4 测试

package strategy;

/************************************************
 *@ClassName : Test
 *@Description : TODO
 *@Author : NikolaZhang
 *@Date : 【2018/11/28 21:58】
 *@Version : 1.0.0
 *************************************************/

public class Test {
    public static void main(String[] args) {
        StartWork startWork1 = new StartWork(new BuyMetalImpl());
        startWork1.start();
        StartWork startWork2 = new StartWork(new DesignCarModelImpl());
        startWork2.start();
        StartWork startWork3 = new StartWork(new MakeCarImpl());
        startWork3.start();
    }
}

1.5 结果

1.6 UML