java设计模式(二)---工厂方法模式

2普通工厂方法模式

就是建立一个工厂类，对实现了同一接口的一些类进行实例的创建。

2.1创建接口

1 /**
2  * 发送接口
3  * Created by mrf on 2016/2/25.
4  */
5 public interface Sender {
6     public String send();
7 }

2.2创建两个实现

 1 /**
 2  * 邮件发送
 3  * Created by mrf on 2016/2/25.
 4  */
 5 public class MailSender implements Sender {
 6     @Override
 7     public String send() {
 8         System.out.println("This is emailSender!");
　　　　　　 return "email";
 9     }
10 }
11 
12 /**
13  * 短信发送
14  * Created by mrf on 2016/2/25.
15  */
16 public class SmsSender implements Sender {
17     @Override
18     public String send() {
19         System.out.println("This is SmsSender!!");return "sms";
20     }
21 }

2.3创建工厂

 1 /**
 2  * 发送工厂
 3  * Created by mrf on 2016/2/25.
 4  */
 5 public class SendFactory {
 6 
 7     public Sender produce(String type){
 8         if("email".equals(type)){
 9             return new MailSender();
10         }
11         if ("sms".equals(type)){
12             return new SmsSender();
13         }
14         System.out.println("输入类型不正确！");
15         return null;
16     }
17 }

2.4使用测试

 SendFactoryTest {

    protected long startTime;
    protected long endTime;

    @Before
    public void setUp() throws Exception {
        this.startTime= System.currentTimeMillis();
        System.out.println("=========开始测试===========");
    }

    @After
    public void tearDown() throws Exception {
        this.endTime = System.currentTimeMillis();
        System.out.println("测试用时："+(endTime-startTime));
        System.out.println("=========测试结束===========");
    }

    @Test
    public void testProduce() throws Exception {
        SendFactory sendFactory = new SendFactory();
        Sender sender = sendFactory.produce("email");
        String send = sender.send();
} }

 2.5多个工厂方法模式

package com.test.java.designPattern.factory;

/**
 * 多个工厂模式
 * <p>
 *     是对普通工厂方法模式的改进。因为普通方法模式中key错误则不能正确创建对象，
 *     多个工厂模式提供多个创建方法。
 * </p>
 * Created by mrf on 2016/2/26.
 */
public class MultiSendFacoty {

    public Sender produceMail(){
        return  new MailSender();
    }

    public Sender produceSms(){
        return  new SmsSender();
    }
}

测试：

package com.test.java.designPattern.factory;

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

/**
 * Created by mrf on 2016/2/26.
 */
public class MultiSendFacotyTest {
    private MultiSendFacoty facoty;

    @Before
    public void setUp(){
        facoty = new MultiSendFacoty();
    }

    @Test
    public void testProduceMail() throws Exception {
        Sender sender = facoty.produceMail();
        sender.send();

    }

    @Test
    public void testProduceSms() throws Exception {
        Sender sender = facoty.produceSms();
        sender.send();
    }
}

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