6、线程的优先级

线程优先级分为10个等级，主线程优先级不变，优先级越高代表执行的顺序越靠前，但不排除出现优先级低的线程先运行。
线程若想设置优先级，必须先设置再启动！！！

package com.example.demo.thread;

/**
 * @projectName: demo
 * @package: com.example.demo.thread
 * @className: TestPriority
 * @author: 
 * @description: 测试线程的优先级
 * @date: 2021/12/7 22:06
 */
public class TestPriority {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName()+":------------------>"+Thread.currentThread().getPriority());

        MyPriority myPriority = new MyPriority();
        Thread t1 = new Thread(myPriority,"t1");
        Thread t2 = new Thread(myPriority,"t2");
        Thread t3 = new Thread(myPriority,"t3");
        Thread t4 = new Thread(myPriority,"t4");
        Thread t5 = new Thread(myPriority,"t5");

        t1.setPriority(Thread.MIN_PRIORITY);
        t2.setPriority(Thread.MAX_PRIORITY);
        t3.setPriority(Thread.NORM_PRIORITY);
        t4.setPriority(7);
        t5.setPriority(3);

        t1.start();
        t2.start();
        t3.start();
        t4.start();
        t5.start();

    }
}
class MyPriority implements Runnable{

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+":------------------>"+Thread.currentThread().getPriority());
    }
}

第一次执行

第二次执行

第N次执行