多线程---线程优先级

线程优先级

 

 

package com.mokuiran.thread;
​
//测试线程的优先级
//注意：优先级低只是意味着获得调度的概率低，并不是优先级低就不会被调用了，这都是看CPU的调度
//优先级高的并不一定就先执行，需要看CPU的调度
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 thread1 = new Thread(myPriority);
        Thread thread2 = new Thread(myPriority);
        Thread thread3 = new Thread(myPriority);
        Thread thread4 = new Thread(myPriority);
        Thread thread5 = new Thread(myPriority);
​
        //先设置优先级，再启动
        thread1.start();//默认为5
​
        thread2.setPriority(1);
        thread2.start();
​
        thread3.setPriority(4);
        thread3.start();
​
        thread4.setPriority(Thread.MAX_PRIORITY);//MIN_PRIORITY=10
        thread4.start();
​
        thread5.setPriority(8);
        thread5.start();
​
    }
}
class MyPriority implements Runnable{
​
    @Override
    public void run() {
        try {
            Thread.sleep(1000);//设置延时，可以让优先级高的先执行的概率增加
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }
}