Java uses the yield() function of the Thread class to pause the execution of the current thread and give up CPU resources.

Java uses the yield() function of the Thread class to pause the execution of the current thread and give up CPU resources.

In concurrent programming, sometimes it is necessary to control the execution order and priority of threads. Java's Thread class provides The yield() function is used to implement this function.

The yield() function is a static method. Calling it will suspend the execution of the current thread and give up CPU resources so that other threads have the opportunity to execute. However, there is no guarantee that the current thread will stop execution immediately. Instead, the CPU resources will be given to other threads, and the system will decide whether to execute other threads immediately.

Let’s demonstrate the use of the yield() function:

public class YieldExample implements Runnable {

   public void run() {
      for (int i = 0; i < 5; i++) {
         System.out.println(Thread.currentThread().getName() + ": " + i);
         // 使用yield()函数暂停当前线程
         Thread.yield();
      }
   }

   public static void main(String[] args) {
      Thread t1 = new Thread(new YieldExample(), "Thread 1");
      Thread t2 = new Thread(new YieldExample(), "Thread 2");

      t1.start();
      t2.start();
   }
}

In the above code, we created two threads t1 and t2, both of which called run() of the YieldExample class method. In the run() method, we use the yield() function to release CPU resources.

Running the above code, we can see that the two threads execute alternately. After each thread executes a loop, the yield() function will be called to give up CPU resources and give other threads a chance to execute.

The use of the yield() function can help us control the execution order and priority of threads, but it should be noted that it only assists in controlling the execution of threads, and the specific scheduling is still determined by the operating system. Moreover, using the yield() function too much or unreasonably may lead to a decrease in thread execution efficiency and even affect the overall performance of the system.

Therefore, when using the yield() function, you need to pay attention to its reasonable use and try to avoid excessive use or use in key execution code segments. According to specific needs, we can combine other thread control methods, such as join() and sleep() functions to achieve more flexible thread control.

To summarize, the yield() function of Java's Thread class can help us control the execution order and priority of threads. By pausing the execution of the current thread and giving up CPU resources, other threads have the opportunity to execute. However, you need to pay attention to reasonable use and avoid excessive use or use in key execution code segments to avoid affecting the overall performance of the system.

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