Java controls the execution sequence of multiple threads

 

package com.yihaomen.mybatis.inter;    import java.io.IOException;    public class TestThread {        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 {      static int count;      volatile int target = 1;        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();          }      }        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();          }      }        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();          }      }  }  

 

Output result:

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