怎么在Java中创建一个线程

package com.threadtest; class MyThread extends Thread{      private int ticket = 10;   private String name;   public MyThread(String name){     this.name =name;   }      public void run(){     for(int i =0;i<500;i++){       if(this.ticket>0){         System.out.println(this.name+"卖票---->"+(this.ticket--));       }     }   } } public class ThreadDemo {       public static void main(String[] args) {     MyThread mt1= new MyThread("一号窗口");     MyThread mt2= new MyThread("二号窗口");     MyThread mt3= new MyThread("三号窗口");     mt1.start();     mt2.start();     mt3.start();   }  }