public class TestYield
{
        public static void main(String[] args)
        {
           MyThread one = new MyThread();//第5行
           Thread t1 = new Thread(one);
           Thread t2 = new Thread(one);//第7行
                     
           
//           MyThread one = new MyThread();
//           MyThread two = new MyThread();
//           Thread t1 = new Thread(one);
//           Thread t2 = new Thread(two);
           
           t1.setName("线程A");
           t2.setName("线程B");
           
           t1.start();
           t2.start();
        }
}
class MyThread implements Runnable
{
        public void run()
        {
            for(int i=1;i<=100;i++)
            {
                        System.out.println(Thread.currentThread().getName()+": "+i);
                      if(0 == i%10)
                      {
                        Thread.yield();
                      }
            }
          }
}








问题：如果第5行到第7行换成注释部分的话，两者有什么区别吗？
有没有深层次的理解 虽然两者运行结果完全一样 但为什么有时候用前者 而有时候用后者