1 /** 2  * 问题：有线程a、b、c，如何让它们顺序执行？ 3  * 方式一：可用Join()方法实现 4  * 方式二：可用newSingleThreadExecutor() 5  * Created by Smile on 2018/8/12. 6  */ 7 public class ThreadByOrder { 8  9     public static void main(String[] args) throws InterruptedException {10 11         Thread a = new Thread(new ThreadTest("a"));12         Thread b = new Thread(new ThreadTest("b"));13         Thread c = new Thread(new ThreadTest("c"));14 15         //方式一实现16         a.start();17         a.join();18         b.start();19         b.join();20         c.start();21 22         Thread d = new Thread(new ThreadTest("d"));23         Thread e = new Thread(new ThreadTest("e"));24         Thread f = new Thread(new ThreadTest("f"));25         //方式二实现26         ExecutorService singlePool = Executors.newSingleThreadExecutor();27         singlePool.submit(d);28         singlePool.submit(e);29         singlePool.submit(f);30         singlePool.shutdown();31     }32 33     static class ThreadTest implements Runnable{34 35         private String threadName;36 37         public ThreadTest(String name){38             this.threadName = name;39         }40 41         public ThreadTest() {42         }43 44         public void run() {45             if("a".equals(threadName)||"f".equals(threadName))46                 try {47                     Thread.sleep(5000);48                 } catch (InterruptedException e) {49                     e.printStackTrace();50                 }51             System.out.println("thread "+threadName+" is running...");52         }53     }54 }