package com.

public class SaleTicket2 implements Runnable{
    private int i = 1;
    public void run(){
        while(i<=20){
            System.out.println(i + " ");
            i++;
            Thread.yield();
        }
    }
}

package com.

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        SaleTicket2 st = new SaleTicket2();
        Thread t1 = new Thread(st);
        Thread t2 = new Thread(st);
        Thread t3 = new Thread(st);
        t1.start();
        t2.start();
        t3.start();
    }

}


输出:
1
2
3
4
5
4
6
6
8
7
11
10
9
13
12
15
14
17
16
19
18
20

为什么不是按顺序的 1,2,3,4.....20,而是有些顺序乱了,有些重复的了?

噢... 原来如此吖.. 谢谢吖