线程同步synchronized(m)

package com.veer;

public class ThreadDemo {

   public static void main(String[] args) throws InterruptedException{

        Object obj = new Object();

       for (int i = 0; i < 10; ++i) {

             new Thread(new MyThread(i,obj)).start();

       }

   }

}

class MyThread implements java.lang.Runnable {

    private int threadId;

    private Object m;

    public MyThread(int id,Object m) {

       this.threadId = id;

       this.m= m;

    }

    public void  run() {

      // TODO Auto-generated method stub

       synchronized(m){

          for (int i = 0; i <100; ++i) {

             System.out.println("Thread ID: " + this.threadId + " : " + i);

          }

       }

   }

}