java 多线程代码

package com.jacob.activeX;

import java.util.concurrent.TimeUnit;

public class Test implements Runnable {

 int ticket = 20;// 票号

 public static void main(String[] args) {

  Test a = new Test();

  // 同时启动三个线程

  Thread thread = new Thread(a);

  thread.setName("1号窗口");

  thread.start();

  Thread thread2 = new Thread(a);

  thread2.setName("2号窗口");

  thread2.start();

  Thread thread3 = new Thread(a);

  thread3.setName("3号窗口");

  thread3.start();

 }

 public void run() {

  while (true) {

   // 加入线程锁保证线程安全 synchronized(Object){

   synchronized (this) {

    for (int i = 0; i < 500000; i++) {
     System.out.println("i=" + i++);
    }
    if (ticket > 0) {

     System.out.println(Thread.currentThread().getName()
       + ":当前票是" + ticket);

     ticket--; // 票号--

    } else {

     break;

    }

    try {

     TimeUnit.MILLISECONDS.sleep(3000);

    } catch (InterruptedException e) {

     // TODO Auto-generated catch block

     e.printStackTrace();

    }

   }

  }

 }

}