起三个线程依次读取一个数组的数据，同时只有一个线程执行？

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我是靠谱客的博主大力树叶，最近开发中收集的这篇文章主要介绍起三个线程依次读取一个数组的数据，同时只有一个线程执行？，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

public class ReadString {
   private String[] read = {"1","2","3","4","5","6","7","8","9","10"};
   public synchronized void read(int id ,int index){
       if(index > 9)
           return;
       System.out.print("Thread :"+id+" read String :"+ read[index]+" n");
   }
}

public class ReadThread extends Thread {

   private int threadId;
   private ReadString reads;
   private Object lock;
   private final int COUNT = 3;
   public static volatile int flag = 0;

   public ReadThread(int id ,ReadString read,Object lock){
       this.threadId = id;
       this.reads = read;
       this.lock = lock;
   }

   @Override
   public void run() {
       // TODO Auto-generated method stub
       while(true){
           synchronized (lock) {
               if((flag%COUNT) == threadId){
                   reads.read(threadId,flag);
                   flag++;
                   lock.notifyAll();
               } else {
                   try {
                       lock.wait();
                   } catch (InterruptedException e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
                   }
               }
           }
       }
   }
}

public class TestMain {
   public static ReadString read;
   public static void main(String[] args){
       Object lock = new Object();
       read = new ReadString();
       new ReadThread(0,read,lock).start();
       new ReadThread(1,read,lock).start();
       new ReadThread(2,read,lock).start();
   }

}