【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...");
         }
     }
 }