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一、新建一个类实现Runnable接口

package Thread;import java.text.SimpleDateFormat;import java.util.Date;import java.util.concurrent.TimeUnit;/** * @author tanhw119214 * @version JDK1.8.0_171 * @date on  2018/8/6 13:56 */public class ThreadRunner implements Runnable {    private static SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss SSS");   public ThreadRunner(Integer num){       this.num=num;   }    private Integer num;    @Override    public void run() {        System.out.println(Thread.currentThread().getName()+" @"+format.format(new Date())+",num:"+num);        try {            TimeUnit.SECONDS.sleep(1);        } catch (InterruptedException e) {            e.printStackTrace();        }    }}

二、写一个测试类，用线程池来创建线程。

package Thread;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * @author tanhw119214 * @version JDK1.8.0_171 * @date on  2018/8/6 14:07 * @description 定长线程池 */public class FixedThreedPoolDemo {    public static void main(String[] args) {        ExecutorService pool = Executors.newFixedThreadPool(4);        for(int i = 0 ; i < 50 ; i++){            pool.submit(new ThreadRunner((i + 1)));        }        pool.shutdown();    }}

如果取消Thread.sleep()的话就会出现

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