线程设置优先级-给CPU提建议，CPU可以不听

在线程里面有个概念，叫做优先级priority
可以给线程设置优先级，1-10；数字越大，优先级越高
但是：你以为优先级高的一定会优先执行吗？
NONONO
设置优先级按优先级执行，只是给CPU提建议，CPU听不听，看他心情
看代码：

package com.bes.mybatis_plus.Test1.TestPriority;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);//先设置优先级，再启动t1.start();t2.setPriority(Thread.MIN_PRIORITY);t2.start();t3.setPriority(3);t3.start();t4.setPriority(5);t4.start();t5.setPriority(7);t5.start();t6.setPriority(Thread.MAX_PRIORITY);t6.start();}
}class MyPriority implements Runnable {@Overridepublic void run() {System.out.println(Thread.currentThread().getName() + "-->" + Thread.currentThread().getPriority());}
}

执行结果，箭头后的数字是优先级，上下顺序表示执行顺序：

main-->5
Thread-0-->5
Thread-5-->10
Thread-4-->7
Thread-2-->3
Thread-3-->4
Thread-1-->1

main-->5
Thread-0-->5
Thread-3-->5
Thread-4-->7
Thread-5-->10
Thread-2-->3
Thread-1-->1

main-->5
Thread-2-->3
Thread-5-->10
Thread-3-->5
Thread-4-->7
Thread-0-->5
Thread-1-->1

从结果可以看出：
并不严格按照优先级执行线程，但是隐约也有趋势，优先级高的先执行

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