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？_2.编写一个程序,开启3个线程,去读取数组中的资源,要求读取的数据不能重复-优快云博客

本文介绍了一个使用Java实现的多线程同步读取字符串数组的案例。通过synchronized关键字和wait/notifyAll机制，确保了三个线程能够按预定顺序轮流读取字符串，展示了线程间的同步控制和资源共享。

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();
   }

}