class Example6_1
{
public static void main (String [] args){
  innThread mt = new innThread ();
  mt.start ();
  for (int i = 0; i < 50; i++)
    System.out.println ("i = " + i);
  }
}
//通过继承Thread实现线程
class innThread extends Thread
{
  public void run ()
  {
    for (int count = 1, row = 1; row < 20; row++, count++)
    {
       for (int i = 0; i < count; i++)
          System.out.print ('*');
       System.out.print ('\n');
    }
  }
}
线程重 mt.start ();开始，请问哪里结束还有就是row起到什么作用