队列存放多用户的多发事件请求，线程监控队列来获取队列信息

User.java类：模拟web的多用户请求

QueueTest类：队列接受User 监控线程监控队列

package test;
public class User {
 public User(String name){
  
 }
 public static void main(String[] args) {
  User user=new User("xiaohong");
       
        for (int i = 0; i < 1000; i++) {
            QueueTest.getInstance().putCLQ(user);
            try {
    Thread.sleep(500);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
        }
  
 }

}

 

 

package test;

import java.util.ArrayList;
import java.util.concurrent.ConcurrentLinkedQueue;

public class QueueTest implements Runnable {
 private static ConcurrentLinkedQueue<User> clq = null;
 private static QueueTest qt=null;
 private QueueTest(){}
 public static QueueTest getInstance(){
  if(qt==null){
   synchronized (QueueTest.class) {
    if(qt==null){
     qt=new QueueTest();
                    main(null);//当qt为null的时候 运行一次 不为null的时候 就不会调用了
    }
   }
  }
  return qt;
 }
 static {
  clq = new ConcurrentLinkedQueue<User>();
 }
 public static  void putCLQ(User user){
  synchronized (clq) {
   clq.add(user);
  }
 }

 public void run() {
  while(true){
    System.out.println(clq.size());
  try {
   Thread.sleep(1000);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  }
 }

 public static void main(String[] args) {
  QueueTest qt=new QueueTest();
  Thread th=new Thread(qt);
  th.start();

 }

}