【Java并发】线程的顺序执行

 /**

  * 问题：有线程a、b、c，如何让它们顺序执行？

  * 方式一：可用Join()方法实现

  * 方式二：可用newSingleThreadExecutor()

  * Created by Smile on 2018/8/12.

  */

 public class ThreadByOrder {

     public static void main(String[] args) throws InterruptedException {

         Thread a = new Thread(new ThreadTest("a"));

         Thread b = new Thread(new ThreadTest("b"));

         Thread c = new Thread(new ThreadTest("c"));

         //方式一实现

         a.start();

         a.join();

         b.start();

         b.join();

         c.start();

         Thread d = new Thread(new ThreadTest("d"));

         Thread e = new Thread(new ThreadTest("e"));

         Thread f = new Thread(new ThreadTest("f"));

         //方式二实现

         ExecutorService singlePool = Executors.newSingleThreadExecutor();

         singlePool.submit(d);

         singlePool.submit(e);

         singlePool.submit(f);

         singlePool.shutdown();

     }

     static class ThreadTest implements Runnable{

         private String threadName;

         public ThreadTest(String name){

             this.threadName = name;

         }

         public ThreadTest() {

         }

         public void run() {

             if("a".equals(threadName)||"f".equals(threadName))

                 try {

                     Thread.sleep(5000);

                 } catch (InterruptedException e) {

                     e.printStackTrace();

                 }

             System.out.println("thread "+threadName+" is running...");

         }

     }

 }