优先级

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;

使用以下方式改变或获取优先级

getPriority() / setPriority(int XXX)

优先级的设定建议在start()调度前

优先级低意味着获得调度的概率低，不是不会被调用

package Sleep;
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public class TestPriority {
​
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    public static void main(String[] args) {
        //主线程的优先级
        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);
​
        //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);
        t4.start();
        //报错
//        t5.setPriority(-1);
//        t5.start();
//
//        t6.setPriority(11);
//        t6.start();
//
    }
​
}
class MyPriority implements  Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }
}
​