Java线程状态转换

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;
}

NEW ---- 创建了线程对象但尚未调用start()方法时的状态。
RUNNABLE ---- 线程对象调用start()方法后，线程处于可运行状态，此时线程等待获取CPU执行权。
BLOCKED ---- 线程等待获取锁时的状态。
WAITING ---- 线程处于等待状态，处于该状态标识当前线程需要等待其他线程做出一些特定的操作唤醒自己。
TIME_WAITING ---- 超时等待状态，与WAITING不同，在等待指定的时间后会自行返回。
TERMINATED ---- 终止状态，表示当前线程已执行完毕。