Java如何在不同线程中实现运行

package Threads;public class ThreadsDemo1 extends Thread { private String msg; private int count; public ThreadsDemo1(final String msg, int n) {  this.msg = msg;  count = n;  setName(msg + " runner Thread"); } public void run() {  while (count-- > 0) {   System.out.println(msg);   try {    Thread.sleep(100);   } catch (InterruptedException e) {    return;   }  }  System.out.println(msg + " all done."); } public static void main(String[] args) {  new ThreadsDemo1("Hello from X", 10).start();  new ThreadsDemo1("Hello from Y", 15).start(); }}