线程的五大状态

 

package com.cn;

/*
 * 1、建议线程正常停止--》利用次数，不建议死循环
 * 2、建议使用标志位---》设置一个标志位
 * 3、不要使用stop或者destroy等过时方法或者JDK不建议使用的方法
 * */
public class TestStop implements Runnable {
    //设置一个标志位
    private boolean flag = true;

    @Override
    public void run() {
        int i = 0;
        while (flag) {
            System.out.println("run......Thread" + i++);
        }
    }

    public void Stop() {
        this.flag = false;
    }

    public static void main(String[] args) {
        TestStop testStop = new TestStop();
        new Thread(testStop).start();
        for (int i = 0; i < 904; i++) {
            System.out.println("main" + i);
            if (i == 900) {
                //调用stop方法切换标志位，让线程停止
                testStop.Stop();
                System.out.println("线程该停止了！");
            }
        }
    }
}

 

package com.cn;

import java.text.SimpleDateFormat;
import java.util.Date;

public class TestSleep {
    public static void main(String[] args) throws InterruptedException {
        //获取系统当前时间
        Date date = new Date(System.currentTimeMillis());

        while (true) {
            //睡眠一秒
            Thread.sleep(1000);
            System.out.println(new SimpleDateFormat("HH:mm:ss").format(date));
            //更新系统当前时间
            date = new Date(System.currentTimeMillis());
        }
    }
}

package com.cn;

//测试礼让线程
//礼让不一定能成功
public class TestYied {

    public static void main(String[] args) {
        MyYied myYied = new MyYied();
        new Thread(myYied, "小明").start();
        new Thread(myYied, "小黄").start();

    }

}

class MyYied implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"线程执行开始");
        Thread.yield();
        System.out.println(Thread.currentThread().getName()+"线程执行结束");
    }
}

 

package com.cn;

public class TestJoin implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i < 200; i++) {
            System.out.println("vip来了！"+i);
        }
    }


    public static void main(String[] args) throws InterruptedException {
        //线程启动
        TestJoin testJoin = new TestJoin();
        Thread thread = new Thread(testJoin);
        thread.start();

        //主线程
        for (int i = 0; i < 1000; i++) {
            while (i == 200) {
                thread.join(); //插队
            }
            System.out.println("main"+i);
        }
    }
}

 

 

package com.cn;

import org.apache.commons.io.output.ThresholdingOutputStream;

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
        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
        }


    }
}

package com.cn;

public class TestPriority {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName() + "-->" + Thread.currentThread().getPriority());
        Thread thread = new Thread(new MyPriority(), "线程1");
        thread.start();
        Thread thread1 = new Thread(new MyPriority(), "线程2");
        thread1.setPriority(Thread.MAX_PRIORITY);
        thread1.start();
    }

}

class MyPriority implements Runnable {

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