Java控制多线程执行顺序

package net.jasonjiang.thread;

import java.io.IOException;  

public class ThreadTestNew {  

    public static void main(String[] args) throws IOException {
        final Test obj = new Test();  

        new Thread() {
            public void run() {
                obj.m1();
            }
        }.start();
        new Thread() {
            public void run() {
                obj.m2();
            }
        }.start();
        new Thread() {
            public void run() {
                obj.m3();
            }
        }.start();  

    }  

}  

class Test {
    volatile int target = 1;  

    public synchronized void m1() {
        for (int i = 0; i < 10; i++) {
            while (target == 2 || target == 3) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("m1() =" + i);
            target = 2;
            notifyAll();
        }
    }  

    public synchronized void m2() {
        for (int i = 0; i < 10; i++) {
            while (target == 1 || target == 3) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("m2() =" + i);
            target = 3;
            notifyAll();
        }
    }  

    public synchronized void m3() {
        for (int i = 0; i < 10; i++) {
            while (target == 1 || target == 2) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("m3() =" + i);
            target = 1;
            notifyAll();
        }
    }
}

运行结果：

m1() =0
m2() =0
m3() =0
m1() =1
m2() =1
m3() =1
m1() =2
m2() =2
m3() =2
m1() =3
m2() =3
m3() =3
m1() =4
m2() =4
m3() =4
m1() =5
m2() =5
m3() =5
m1() =6
m2() =6
m3() =6
m1() =7
m2() =7
m3() =7
m1() =8
m2() =8
m3() =8
m1() =9
m2() =9
m3() =9