Thread

Thread几种状态

NEW(未启动状态)

Thread t = new Thread() {
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
    }
};
System.out.println(t.getState().name());

RUNNABLE(可运行状态)

处于可运行状态的线程正在 Java 虚拟机中执行，但也可能是正在等待来自操作系统资源，例如 CPU。

Thread t = new Thread() {
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
    }
};
t.start();
System.out.println(t.getState().name());

BLOCKED(阻塞状态)

final Object lock = new Object();

Thread t = new Thread() {
    @Override
    public void run() {
        synchronized (lock) {
            System.out.println(Thread.currentThread().getName());
        }
    }
};

synchronized (lock) {
    try {
        t.start();
        Thread.sleep(1000);
        System.out.println(t.getState().name());
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

WAITING(等待状态)

调用以下方法，使线程处于等待状态：

Object.wait()、Thread.join()、LockSupport.park()

TIMED_WAITING(具有指定时间的等待状态)

Thread t = new Thread() {
    @Override
    public void run() {
        try {
            Thread.sleep(2000);
            System.out.println(Thread.currentThread().getName());
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
};
t.start();

try {
    Thread.sleep(1000);
} catch (InterruptedException e) {
    e.printStackTrace();
}
System.out.println(t.getState().name());

TERMINATED(已终止线程的线程状态或线程已完成执行)

Thread t = new Thread() {
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
    }
};
t.start();

try {
    Thread.sleep(1000);
} catch (InterruptedException e) {
    e.printStackTrace();
}
System.out.println(t.getState().name());