Java学习-069-多线程02：实现 Runnable 接口

本文通过实现 Runnable 接口实现多线程，源代码如下所示：

package com.fanfengping.demo;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class Demo01Runnable implements Runnable{
    private Thread t;
    private String threadName;

    Demo01Runnable(String tName) {
        threadName = tName;
        log.info("Create a Runnable : {}", threadName);
    }

    @Override
    public void run() {
        log.info("Running Runnable Thread : {}", threadName);

        try {
            for(int i = 3; i > 0; i--) {
                log.info("Current Runnable name is {}, work batch : {}", threadName, i);
                Thread.sleep(500);
            }
        } catch (InterruptedException e) {
            log.info("Runnable {} interrupted!", threadName);
            e.printStackTrace();
        }

        log.info("Runnable {} exit", threadName);
    }

    public void start() {
        log.info("Start Runnable : {}", threadName);
        if (t == null) {
            t = new Thread(this, threadName);
            t.start();
        }
    }
}

测试源代码如下所示：

package com.fanfengping.demo;

import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;

@Slf4j
public class Demo01RunnableTest {
    @Test
    public void test() throws InterruptedException {
        Demo01Runnable t1 = new Demo01Runnable("Runnable-1");
        Demo01Runnable t2 = new Demo01Runnable("Runnable-2");
        Demo01Runnable t3 = new Demo01Runnable("Runnable-3");
        Demo01Runnable t4 = new Demo01Runnable("Runnable-4");
        Demo01Runnable t5 = new Demo01Runnable("Runnable-5");
        t1.start();
        t2.start();
        t3.start();
        t4.start();
        t5.start();

        // 延长一定时间，否则test执行完成后，子线程会终止
        Thread.sleep(10000);
        log.info("Test Cancel");
    }

    public static void main(String args[]) {
        Demo01Runnable t1 = new Demo01Runnable("Runnable 1");
        Demo01Runnable t2 = new Demo01Runnable("Runnable 2");
        Demo01Runnable t3 = new Demo01Runnable("Runnable 3");
        Demo01Runnable t4 = new Demo01Runnable("Runnable 4");
        Demo01Runnable t5 = new Demo01Runnable("Runnable 5");
        t1.start();
        t2.start();
        t3.start();
        t4.start();
        t5.start();
    }
}

测试源代码中通过 TestNG 测试方法和 main 方法进行测试，使用 TestNG 进行测试时，若未添加休眠延时 Thread.sleep(10000)，在测试方法执行完成后，启动的子线程也就随之结束了，此时子线程并未完成执行完成，若需要完全执行完成，需要添加 Thread.sleep，并设置休眠时间大于所有子线程执行时间总和，才可使得子线程得以成功执行完成。

@Test 方法未设置休眠时，输出的日志信息如下所示：

[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable-1
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable-2
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable-3
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable-4
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable-5
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable-1
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable-2
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable-3
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable-4
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable-5
[main] INFO com.fanfengping.demo.Demo01RunnableTest - Test Cancel
[Runnable-1] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable-1
[Runnable-1] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable-1, work batch : 40
[Runnable-5] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable-5
[Runnable-4] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable-4
[Runnable-4] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable-4, work batch : 40
[Runnable-2] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable-2
[Runnable-3] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable-3
[Runnable-5] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable-5, work batch : 40
[Runnable-3] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable-3, work batch : 40
[Runnable-2] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable-2, work batch : 40

使用 main 方法或 @Test 方法启用休眠时，输出的结果如下所示：

[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable 1
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable 2
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable 3
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable 4
[main] INFO com.fanfengping.demo.Demo01Runnable - Create a Runnable : Runnable 5
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable 1
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable 2
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable 3
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable 4
[Runnable 2] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable 2
[Runnable 1] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable 1
[Runnable 1] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 1, work batch : 3
[Runnable 2] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 2, work batch : 3
[main] INFO com.fanfengping.demo.Demo01Runnable - Start Runnable : Runnable 5
[Runnable 4] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable 4
[Runnable 4] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 4, work batch : 3
[Runnable 3] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable 3
[Runnable 3] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 3, work batch : 3
[Runnable 5] INFO com.fanfengping.demo.Demo01Runnable - Running Runnable Thread : Runnable 5
[Runnable 5] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 5, work batch : 3
[Runnable 5] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 5, work batch : 2
[Runnable 4] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 4, work batch : 2
[Runnable 3] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 3, work batch : 2
[Runnable 2] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 2, work batch : 2
[Runnable 1] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 1, work batch : 2
[Runnable 2] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 2, work batch : 1
[Runnable 1] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 1, work batch : 1
[Runnable 5] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 5, work batch : 1
[Runnable 3] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 3, work batch : 1
[Runnable 4] INFO com.fanfengping.demo.Demo01Runnable - Current Runnable name is Runnable 4, work batch : 1
[Runnable 2] INFO com.fanfengping.demo.Demo01Runnable - Runnable Runnable 2 exit
[Runnable 4] INFO com.fanfengping.demo.Demo01Runnable - Runnable Runnable 4 exit
[Runnable 1] INFO com.fanfengping.demo.Demo01Runnable - Runnable Runnable 1 exit
[Runnable 3] INFO com.fanfengping.demo.Demo01Runnable - Runnable Runnable 3 exit
[Runnable 5] INFO com.fanfengping.demo.Demo01Runnable - Runnable Runnable 5 exit