线程状态&线程优先级&守护线程

线程状态

package com.deng.state;

//观察测试现成的状态
public class TestState {

    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("/////");
        });

        //观察状态
        Thread.State state = thread.getState();
        System.out.println(state);//NEW

        //观察启动后
        thread.start();//启动线程
        state = thread.getState();
        System.out.println(state);//Run

        while (state != Thread.State.TERMINATED) {//只要线程不终止，就一直输出状态
            Thread.sleep(100);
            state = thread.getState();//更新线程状态
            System.out.println(state);//输出状态
        }
    }
}

线程优先级

package com.deng.state;

//测试线程的优先级
public class TestPriority {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName() + "-->" + Thread.currentThread().getPriority());

        MyPriorty myPriorty = new MyPriorty();
        Thread t1 = new Thread(myPriorty);
        Thread t2 = new Thread(myPriorty);
        Thread t3 = new Thread(myPriorty);
        Thread t4 = new Thread(myPriorty);
        Thread t5 = new Thread(myPriorty);
        Thread t6 = new Thread(myPriorty);

        //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);//MAX_PRIORITY=10
        t4.start();

        t5.setPriority(8);
        t5.start();

        t6.setPriority(7);
        t6.start();

    }
}

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

守护线程

package com.deng.state;

//测试守护线程
//上帝保护你
public class TestDaemon {
    public static void main(String[] args) {
        God god = new God();
        You you = new You();

        Thread thread = new Thread(god);
        thread.setDaemon(true);//默认是false表示是用户线程，正常的线程都是用户线程...

        thread.start();//上帝守护线程启动

        new Thread(you).start();//你 用户线程启动...

    }
}

//上帝
class God implements Runnable {
    @Override
    public void run() {
        while (true) {
            System.out.println("上帝保佑着你");
        }
    }
}

//你
class You implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i < 36500; i++) {
            System.out.println("你一生都开心的活着");
        }
        System.out.println("===goodbye!world!");
    }
}