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1.1.2 线程状态

1.1.2 线程状态

作者: 叶凯飞 | 来源:发表于2020-02-12 12:19 被阅读0次

    6个状态的定义:java.lang.Thread.State

    1. New: 尚未启动的线程的线程状态。

    2. Runnable: 可运行线程的线程状态,等待CPU的调度。

    3. Blocked: 线程阻塞等待监视器锁定的线程状态。

    4. Waiting: 等待线程的线程状态。下列不带超时的方式:

      Object.waiting、Thread.join、LockSupport.port

    5. Timed Waiting: 具有指定等待时间的等待线程的线程状态。下列带超时时间的方式:

      Thread.sleep、Object.wait、Thread.join、LockSupport.parkNanos、LockSupport.parkUntil

    6. Terminated: 终止线程的线程状态。线程正常完成执行或者出现异常。

    截屏2020-02-12下午12.16.01.png
    package firthChapter;
    
    /**
     * 示例二,多线程运行状态切换示意
     * @author yekaifei
     */
    public class Demo2 {
        //第一种状态切换: 新建->运行->终止
    
    
        //第二种状态切换: 新建->运行->等待->运行->终止
        //第三种状态切换: 新建->运行->阻塞->运行->终止
        public static void main(String[] args) throws InterruptedException {
            System.out.println("第一种状态切换: 新建->运行->终止");
            Thread thread1 = new Thread(new Runnable() {
                public void run() {
                    System.out.println("thread1当前状态:" + Thread.currentThread().getState().toString());
                    System.out.println("thread1执行了");
                }
            });
            System.out.println("thread1未运行时状态:" + thread1.getState().toString());
            thread1.start();
            Thread.sleep(2000);
            System.out.println("线程睡眠两秒等待thread1运行完毕查看状态:" + thread1.getState().toString());
    //        thread1.start();  TODO 注意若线程终止后再调用会报一个java.lang.IllegalThreadStateException
    
            System.out.println("-------------------------------------------------");
            System.out.println("第二种状态切换: 新建->运行->等待->运行->终止");
            Thread thread2 = new Thread(new Runnable() {
                public void run() {
                    System.out.println("thread2当前状态:" + Thread.currentThread().getState().toString());
                    System.out.println("thread2正在执行");
                    try {
                        System.out.println("thread线程进入等待");
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("thread2睡眠完毕后当前状态:" + Thread.currentThread().getState().toString());
                }
            });
            System.out.println("thread2未运行时状态:" + thread2.getState().toString());
            thread2.start();
            Thread.sleep(1000);
            System.out.println("线程睡眠1s等待thread2进入睡眠查看状态:" + thread2.getState().toString());
            Thread.sleep(1000);
            System.out.println("线程再睡眠1s等待thread2运行完毕后查看状态:" + thread2.getState().toString());
    
            System.out.println("-------------------------------------------------");
            System.out.println("第三种状态切换: 新建->运行->阻塞->运行->终止");
            Thread thread3 = new Thread(new Runnable() {
                public void run() {
                    System.out.println("thread3当前状态:" + Thread.currentThread().getState().toString());
                    synchronized (Demo2.class){
                        System.out.println("thread3当前状态:" + Thread.currentThread().getState().toString());
                    }
                }
            });
            synchronized (Demo2.class) {
                System.out.println("thread3未运行时状态:" + thread3.getState().toString());
                thread3.start();
                Thread.sleep(500);
                System.out.println("thread3进入阻塞状态:" + thread3.getState().toString());
            }
            Thread.sleep(2000);
            System.out.println("线程睡眠2s等待thread3运行完毕查看状态:" + thread3.getState().toString());
        }
    }
    

    运行结果:
    firthChapter.Demo2
    第一种状态切换: 新建->运行->终止
    thread1未运行时状态:NEW
    thread1当前状态:RUNNABLE
    thread1执行了
    线程睡眠两秒等待thread1运行完毕查看状态:TERMINATED


    第二种状态切换: 新建->运行->等待->运行->终止
    thread2未运行时状态:NEW
    thread2当前状态:RUNNABLE
    thread2正在执行
    thread线程进入等待
    线程睡眠1s等待thread2进入睡眠查看状态:TIMED_WAITING
    thread2睡眠完毕后当前状态:RUNNABLE
    线程再睡眠1s等待thread2运行完毕后查看状态:TERMINATED


    第三种状态切换: 新建->运行->阻塞->运行->终止
    thread3未运行时状态:NEW
    thread3当前状态:RUNNABLE
    thread3进入阻塞状态:BLOCKED
    thread3当前状态:RUNNABLE
    线程睡眠2s等待thread3运行完毕查看状态:TERMINATED
    Process finished with exit code 0

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