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;
 }