线程优先级

Mon, 14 Mar 2022 17:50:06 +0800

Java提供一个线程调度器来监控程序中启动后进入就绪状态的所有线程，线程调度器按照优先级决定应该调度哪个线程来执行
线程优先级用数字表示，范围从1~10（线程的调度由CPU决定，数字越大概率越大）
- Thread.MIN_PRIORITY = 1
- Thread.NORM_PRIORITY = 5
- Thread.MAX_PRIORITY = 10
使用以下方法改变或获取线程优先级
- getPriority()
- setPriority(int xxx)

public class TestThreadPriority {
 public static void main(String[] args) {
 // 打印主线程默认优先级
 System.out.println(Thread.currentThread().getName() + "====" + Thread.currentThread().getPriority());

 Priority priority = new Priority();

 Thread t1 = new Thread(priority, "t1");
 Thread t2 = new Thread(priority, "t2");
 Thread t3 = new Thread(priority, "t3");
 Thread t4 = new Thread(priority, "t4");
 Thread t5 = new Thread(priority, "t5");
 Thread t6 = new Thread(priority, "t6");

 t1.start();
 t2.setPriority(1);
 t2.start();
 t3.setPriority(4);
 t3.start();
 t4.setPriority(Thread.MAX_PRIORITY);
 t4.start();
 t5.setPriority(6);
 t5.start();
 t6.setPriority(8);
 t6.start();
 }
}

class Priority implements Runnable {
 @Override
 public void run() {
 System.out.println(Thread.currentThread().getName() + "====" + Thread.currentThread().getPriority());
 }
}

参考资料：

线程优先级 on ffff65535

线程优先级