多线程的创建与使用（二）-优快云博客

本文链接：https://blog.youkuaiyun.com/javaairman/article/details/131414632

文章介绍了Java中多线程的管理，包括线程的运行状态，如创建、就绪、阻塞、运行和死亡，以及如何通过设置标志位来优雅地停止线程。此外，还讨论了Thread.sleep()方法用于线程休眠，以及线程的优先级设置。示例代码展示了线程状态的查询和线程生命周期的不同阶段。

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多线程（二）

线程的状态

创建状态
就绪状态
阻塞状态
运行状态

死亡狂态

如何停止线程

package base.duoxiancheng.Demo05;

public class TestSop implements Runnable {
    private boolean flage=true;

    @Override
    public void run() {
        int i=0;
        while (flage){
            System.out.println("线程运行在"+i++);
        }
    }
    public  void stop(){
        this.flage=false;
    }

    public static void main(String[] args) {
        TestSop testSop=new TestSop();
        new Thread(testSop).start();
        for (int i = 0; i <1000 ; i++) {
            if (i==900){
                testSop.stop();}
            {  System.out.println("运行中"+i);
            }

        }
    }
}

建议让线程自己停下，建议设置一个标志位的终止变量，同个flag的true或者false来终止线程

线程的休眠 Sleep

sleep（设置休眠的毫秒值）

sleep需要有一个异常来抛出

sleep时间到达之后会让线程进入就绪状态

sleep用于模拟延迟或者倒计时

每个对象都有一把锁，但是sleep不会释放锁

模拟倒计时

package base.duoxiancheng.Demo06;

public class Sleeptest implements Runnable {
    private boolean flag=true;

    @Override
    public void run() {

        for (int i = 0; i <=10 ; i++) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            System.out.println(+i);
            if (i==10)
                break;



        }


    }

    public static void main(String[] args) {
        Sleeptest sleeptest =new Sleeptest();
        new Thread(sleeptest).start();
    }
}

## 探知此时线程的状态

package base.duoxiancheng.Demo07;

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) {

                }

            }
            System.out.println("/////");

        });
        Thread.State state = thread.getState();
        System.out.println(state);
        thread.start();
        while (state!=Thread.State.TERMINATED){
            Thread.sleep(100);
            state=thread.getState();
            System.out.println(state);
        }

    }
}

运行结果

NEW
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
/////
TERMINATED

线程的优先级

        thread.setPriority(优先级（1-10）);
        这个一定要在线程运行之前 thread.start之前