yield()方法在Java中的重要性是什么？

public static void yield()

class MyThread extends Thread {
   public void run() {
      for (int i = 0; i < 5; ++i) {
         Thread.yield(); // By calling this method, MyThread stop its execution and giving a chance to a main thread
         System.out.println("Thread started:" + Thread.currentThread().getName());
      }
      System.out.println("Thread ended:" + Thread.currentThread().getName());
   }
}
public class YieldMethodTest {
   public static void main(String[] args) {
      MyThread thread = new MyThread();
<strong>      </strong>thread.start();<strong>
</strong>      for (int i = 0; i < 5; ++i) {
         System.out.println("Thread started:" + Thread.currentThread().getName());
      }
      System.out.println("Thread ended:" + Thread.currentThread().getName());
   }
}

Thread started:main
Thread started:Thread-0
Thread started:main
Thread started:Thread-0
Thread started:main
Thread started:Thread-0
Thread started:main
Thread started:Thread-0
Thread started:main
Thread started:Thread-0
Thread ended:main
Thread ended:Thread-0