同步问题的引出

    1. public class Test extends Object {
    2.     public static void main(String[] args) throws Exception {
    4.         Runnable myThread = new MyThread();
    5.         Thread thread0 = new Thread(myThread);
    6.         Thread thread1 = new Thread(myThread);
    7.         Thread thread2 = new Thread(myThread);
    8.         Thread thread3 = new Thread(myThread);
    9.         Thread thread4 = new Thread(myThread);
    11.         thread0.start();
    12.         thread1.start();
    13.         thread2.start();
    14.         thread3.start();
    15.         thread4.start();
    16.     }
    17. }
    20. //线程操作类
    21. class MyThread implements Runnable {
    22.     private int ticket = 5;
    24.     @Override
    25.     public void run() {
    26.         for (int i = 0; i < 50; i++) {
    27.             if (this.ticket > 0) {
    28.                 try {
    29.                     Thread.sleep(500);
    30.                 } catch (InterruptedException e) {
    31.                     e.printStackTrace();
    32.                 }
    33.                 this.ticket--;
    34.                 System.out.println(Thread.currentThread().getName() + "余票:" + this.ticket);
    35.             }
    36.         }
    37.     }
    38. }

    结果截图
    image.png