【Java多线程】03-线程优先级、守护线程

1、线程的优先级 1-10

public class PriorityTest {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getPriority());
        MyPriority mp = new MyPriority();
        Thread t1 = new Thread(mp,"adidas");
        Thread t2 = new Thread(mp,"nike");
        Thread t3 = new Thread(mp,"hui li ");
        Thread t4 = new Thread(mp,"李宁");
        Thread t5 = new Thread(mp,"puma");
        Thread t6 = new Thread(mp,"安踏");
        //设置优先级  在启动前
        t1.setPriority(Thread.MAX_PRIORITY);
        t2.setPriority(Thread.MAX_PRIORITY);
        t3.setPriority(Thread.MAX_PRIORITY);
        t4.setPriority(Thread.MIN_PRIORITY);
        t5.setPriority(Thread.MIN_PRIORITY);
        t6.setPriority(Thread.MIN_PRIORITY);
        t1.start();
        t2.start();
        t3.start();
        t4.start();
        t5.start();
        t6.start();

    }
}
class MyPriority implements Runnable{
    @Override
    public void run() {
        Thread.yield();
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }
}

2、守护线程

守护线程：是为用户线程服务的 jvm停止不用等待守护线程执行完毕

• 默认：用户线程 jvm等待用户线程 执行完毕 才会停止

/**
 * 守护线程：是为用户线程服务的 jvm停止不用等待守护线程执行完毕
 * 默认：用户线程 jvm等待用户线程 执行完毕 才会停止
 * @author AnQi
 * @date 2020/3/7 10 43:08
 * @description
 */
public class DaemonTest {
    public static void main(String[] args) {
        God god =new God();
        You you = new You();
       Thread t1= new Thread(god);
       t1.setDaemon(true); //将用户线程调整为守护线程
       t1.start();
        new Thread(you).start();

    }
}
class You extends Thread{
    @Override
    public void run() {
        for (int i = 1;i<=365*100;i++){
            System.out.println("happy life ....");
        }
        System.out.println("gg...");
    }
}
class God extends Thread{
    @Override
    public void run() {
        for (int i = 1;i<=365*10000;i++){
            System.out.println("bless you  ....");
        }
    }
}