Java多线程-线程状态

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Java多线程-线程状态

小码农薛尧 2019-08-26 09:58:54 浏览170
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线程状态

6个状态定义: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调度。
  3. Blocked: 线程阻塞等待监视器锁定的线程状态。处于synchronized同步代码块或方法中被阻塞。
  4. Waiting: 等待线程的线程状态。下列不带超时的方式:Object.wait、Thread.join、LockSupport.park
  5. Timed Waiting: 具有指定等待时间的等待线程的线程状态。下列超时的方式:Thread.sleep、Object.wait、Thread.join、LockSupport.parkNanos、LockSupport.parkUntil

image

常见线程状态切换

新建->运行->终止

Thread thread1 = new Thread(new Runnable() {
            @Override
            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("没调用start方法,thread1当前状态:" + thread1.getState().toString());
thread1.start();
Thread.sleep(2000L); // 等待thread1执行结束,再看状态
System.out.println("等待两秒,再看thread1当前状态:" + thread1.getState().toString());

image

新建->运行->等待->运行->终止

Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                try {// 将线程2移动到等待状态,1500后自动唤醒
                    Thread.sleep(1500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("thread2当前状态:" + Thread.currentThread().getState().toString());
                System.out.println("thread2 执行了");
            }
        });
System.out.println("没调用start方法,thread2当前状态:" + thread2.getState().toString());
thread2.start();
System.out.println("调用start方法,thread2当前状态:" + thread2.getState().toString());
Thread.sleep(200L); // 等待200毫秒,再看状态
System.out.println("等待200毫秒,再看thread2当前状态:" + thread2.getState().toString());
Thread.sleep(3000L); // 再等待3秒,让thread2执行完毕,再看状态
System.out.println("等待3秒,再看thread2当前状态:" + thread2.getState().toString());

image

新建->运行->阻塞->运行->终止

Thread thread3 = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (Demo2.class) {
                    System.out.println("thread3当前状态:" + Thread.currentThread().getState().toString());
                    System.out.println("thread3 执行了");
                }
            }
        });
synchronized (Demo2.class) {
    System.out.println("没调用start方法,thread3当前状态:" + thread3.getState().toString());
    thread3.start();
    System.out.println("调用start方法,thread3当前状态:" + thread3.getState().toString());
    Thread.sleep(200L); // 等待200毫秒,再看状态
    System.out.println("等待200毫秒,再看thread3当前状态:" + thread3.getState().toString());
}
Thread.sleep(3000L); // 再等待3秒,让thread3执行完毕,再看状态
System.out.println("等待3秒,让thread3抢到锁,再看thread3当前状态:" + thread3.getState().toString());

image

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