线程优先级

线程优先级

线程的优先级用数字表示，范围从1~10：

• Thread.MIN_PRIORITY =1;
• Thread.MAX_PRIORITY = 10;
• Thread.NORM_PRIORITY = 5;

通过getPriority()和setPriority()方法控制

//测试线程的优先级
public class TestPriority {
    public static void main(String[] args) {
        //主线程默认优先级
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());

        MyPriority myPriority = new MyPriority();

        Thread t1 = new Thread(myPriority);
        Thread t2 = new Thread(myPriority);
        Thread t3 = new Thread(myPriority);
        Thread t4 = new Thread(myPriority);
        Thread t5 = new Thread(myPriority);
        Thread t6 = new Thread(myPriority);

        //注意先设置优先级，再启动
        t1.start();

        t2.setPriority(1);
        t2.start();

        t3.setPriority(4);
        t3.start();

        t4.setPriority(Thread.MAX_PRIORITY);//MAX_PRIORITY=10
        t4.start();

        t5.setPriority(Thread.MIN_PRIORITY);//MAX_PRIORITY = 1
        t5.start();

        t6.setPriority(Thread.NORM_PRIORITY);//NORM_PRIORITY = 5
        t6.start();




    }
}

class MyPriority implements Runnable{
    @Override
    public void run() {

        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }
}

优先级低只是意味着获得调度的概率低，并不是优先级低的就不会被调用了，都是看CPU的调度