Thread 사용법

package sms.it;

import java.lang.*;
import java.io.*;

class ThreadEx extends Thread {
 String name;
 public ThreadEx(String name){
  super(name);
  this.name=name;
 }
 public void run(){
  int i=0;
  while(true){
   System.out.println("쓰레드명:" + name + "숫자:" + i++);
   if(i==10)
    break;
   try{
    sleep(30);
   }catch(Exception e){
    e.printStackTrace();
   }//catch
   
  }//while
 }//run
}//ThreadEx
public class ThreadTestTwo {
 
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
  ThreadEx t1=new ThreadEx("Thread1");
  ThreadEx t2=new ThreadEx("Thread2");
  ThreadEx t3=new ThreadEx("Thread3");
  t1.start();
  t2.start();
  t3.start();

 }

}