Java线程的状态

JDK 1.5 前线程状态

线程状态	中文名称	描述
New	新建	刚创建的线程，还未启动。
Runnable	可运行	线程可以运行，可能在等待 CPU 调度。
Blocked	阻塞	线程被阻塞，正在等待锁的释放。
Dead	终止	线程执行完成或异常终止，已进入结束状态。

JDK 1.5 后线程状态

java.lang.Thread.State

public enum State {
    /**
     * Thread state for a thread which has not yet started.
     */
    NEW,

    /**
     * Thread state for a runnable thread.  A thread in the runnable
     * state is executing in the Java virtual machine but it may
     * be waiting for other resources from the operating system
     * such as processor.
     */
    RUNNABLE,

    /**
     * Thread state for a thread blocked waiting for a monitor lock.
     * A thread in the blocked state is waiting for a monitor lock
     * to enter a synchronized block/method or
     * reenter a synchronized block/method after calling
     * {@link Object#wait() Object.wait}.
     */
    BLOCKED,

    /**
     * Thread state for a waiting thread.
     * A thread is in the waiting state due to calling one of the
     * following methods:
     * <ul>
     *   <li>{@link Object#wait() Object.wait} with no timeout</li>
     *   <li>{@link #join() Thread.join} with no timeout</li>
     *   <li>{@link LockSupport#park() LockSupport.park}</li>
     * </ul>
     *
     * <p>A thread in the waiting state is waiting for another thread to
     * perform a particular action.
     *
     * For example, a thread that has called <tt>Object.wait()</tt>
     * on an object is waiting for another thread to call
     * <tt>Object.notify()</tt> or <tt>Object.notifyAll()</tt> on
     * that object. A thread that has called <tt>Thread.join()</tt>
     * is waiting for a specified thread to terminate.
     */
    WAITING,

    /**
     * Thread state for a waiting thread with a specified waiting time.
     * A thread is in the timed waiting state due to calling one of
     * the following methods with a specified positive waiting time:
     * <ul>
     *   <li>{@link #sleep Thread.sleep}</li>
     *   <li>{@link Object#wait(long) Object.wait} with timeout</li>
     *   <li>{@link #join(long) Thread.join} with timeout</li>
     *   <li>{@link LockSupport#parkNanos LockSupport.parkNanos}</li>
     *   <li>{@link LockSupport#parkUntil LockSupport.parkUntil}</li>
     * </ul>
     */
    TIMED_WAITING,

    /**
     * Thread state for a terminated thread.
     * The thread has completed execution.
     */
    TERMINATED;
}

线程状态	中文名称	描述
New	新建	刚创建的线程，还未启动。
Runnable	可运行	线程可以运行，可能在等待 CPU 调度。
Blocked	阻塞	线程尝试获取锁失败，被阻塞，等待锁释放。
Waiting	等待	线程进入等待状态，等待其他线程显式唤醒，通常由 Object.wait() 引起。
Timed Waiting	计时等待	线程等待指定时间后自动唤醒，由 Thread.sleep() 或 wait(time) 引起。
Terminated	终止	线程执行完成或异常终止，已进入结束状态。