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