java之线程优先级

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java之线程优先级

• 优先级：抢cpu的频率，频率高，cpu执行他的次数多。

• 关键词：setPriority(PRIORITY);

• 示例代码

  public class myRunnable implements Runnable {
      @Override
      public void run() {
          for (int i = 0; i <5 ; i++) {
              try {
                  Thread.sleep(1000);
                  System.out.println(Thread.currentThread().getName()+"::"+i);
              } catch (InterruptedException e) {
                  e.printStackTrace();
              }
  
          }
      }
  }
  

  public class ThreadTest {
      public static void main(String[] args) {
  
          Thread t1 = new Thread(new myRunnable(),"0");
          Thread t2 = new Thread(new myRunnable(),"1");
          Thread t3= new Thread(new myRunnable(),"2");
          t1.setPriority(Thread.MAX_PRIORITY);
          t2.setPriority(Thread.MIN_PRIORITY);
          t3.setPriority(Thread.NORM_PRIORITY);
          t1.start();
          t2.start();
          t3.start();
  
      }
  }
  

• 运行结果

  0::0
  2::0
  1::0
  0::1
  2::1
  1::1
  1::2
  2::2
  0::2
  1::3
  0::3
  2::3
  0::4
  1::4
  2::4
  

• 分析

  • 一般优先级高的会首先执行，一次类推，但是具有偶然性，不一定会按照优先级高低来执行
  • 有不一定会抢到cpu资源，具有可能性；