NEW（A thread that has not yet started is in this state.）
尚未启动的线程处于此状态。 Thread t = new Thread ();
RUNNABLE （A thread executing in the Java virtual machine is in this state.）
在Java虚拟机中执行的线程处于此状态。 new Thread().start();
BLOCKED （A thread that is blocked waiting for a monitor lock is in this state.）
被阻塞等待监视器锁定的线程处于此状态。 synchronized(this) -> while (flag)->obj.wait();
WAITING （A thread that is waiting indefinitely for another thread to perform a particular action is in this state.）
正在等待另一个线程执行特定动作的线程处于此状态。 Object.wait Thread.join LockSupport.park
TIMED_WAITING （A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state.）
正在等待另一个线程执行动作达到指定等待时间的线程处于此状态。 Thread.sleep Object.wait(timeout) Thread.join(timeout) LockSupport.parkNanos LockSupport.parkUntil
TERMINATED （A thread that has exited is in this state.）
已退出的线程处于此状态。