线程状态

public enum State {
/**
     * Thread state for a thread which has not yet started.
     */
NEW,
<p>/**
* 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,</p>
<p>/**
* 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
* {@linkObject#wait() Object.wait}.
*/
BLOCKED,</p>
<p>/**
* Thread state for a waiting thread.
* A thread is in the waiting state due to calling one of the
* following methods:
*<ul>
*<li>{@linkObject#wait() Object.wait} with no timeout</li>
*<li>{@link#join() Thread.join} with no timeout</li>
*<li>{@linkLockSupport#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></p>
<ul>
<li>on an object is waiting for another thread to call
*<tt>Object.notify()</tt>or<tt>Object.notifyAll()</tt>on
<ul>
<li>that object. A thread that has called<tt>Thread.join()</tt></li>
</ul>
</li>
<li>is waiting for a specified thread to terminate.
*/
WAITING,</li>
</ul>
<p>/**
* 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>{@linkObject#wait(long) Object.wait} with timeout</li>
*<li>{@link#join(long) Thread.join} with timeout</li>
*<li>{@linkLockSupport#parkNanos LockSupport.parkNanos}</li>
*<li>{@linkLockSupport#parkUntil LockSupport.parkUntil}</li>
*</ul>
*/
TIMED_WAITING,</p>
<p>/**
* Thread state for a terminated thread.
* The thread has completed execution.
*/
TERMINATED;
}