線程的6種狀態以及轉變：

java的線程一共6種狀態。具體代碼見：

java.lang.Thread.State

1 NEW

新建狀態
Thread state for a thread which has not yet started.
線程還沒有調用start的時候

2 RUNNABLE

可運行狀態
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.
調用start之后，jvm啟動了這個任務，但是可能被其他資源占用線程變成WAITING

3 BLOCKED

阻塞狀態
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}.
線程被鎖的時候，線程等待進去一個synchronized塊方法或者可重入鎖的時候

4 WAITING

等待狀態
Thread state for a waiting thread.
A thread is in the waiting state due to calling one of the
following methods:

• 
  
• {@link Object#wait() Object.wait} with no timeout< li>
  
• {@link #join() Thread.join} with no timeout< li>
  
• {@link LockSupport#park() LockSupport.park}< li>
  < ul>
  

  A thread in the waiting state is waiting for another thread to
  perform a particular action.
  For example, a thread that has called Object.wait()
  on an object is waiting for another thread to call
  Object.notify() or Object.notifyAll() on
  that object A thread that has called Thread.join()

  線程調用object.wait thread.join LockSupport.park 的時候變成 WAITING

5 TIMED_WAITING,

時間等待狀態
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:

• 
  
• {@link #sleep Thread.sleep}< li>
  
• {@link Object#wait(long) Object.wait} with timeout< li>
  
• {@link #join(long) Thread.join} with timeout< li>
  
• {@link LockSupport#parkNanos LockSupport.parkNanos}< li>
  
• {@link LockSupport#parkUntil LockSupport.parkUntil}< li>
  < ul>
  sleep 或者wait,join帶時間參數等方法時

6 TERMINATED

終止狀態
Thread state for a terminated thread.
The thread has completed execution.
線程執行完成 或者被中斷的時候變成TERMINATED
TERMINATED;

狀態流轉圖

線程創建出來就是new的狀態。

start方法調用之后狀態變成runnable,可以執行，如果cpu把時間片切過來就可以執行。

runnable執行完成則變成terminated，或者中斷的時候。

runnable如果遇到有鎖的方法，在等待的時候則是阻塞blocked的狀態

如果調用wait或者join的方法，則變成waiting狀態，

如果調用帶時間參數的wait或者join,則變成time_waiting。

總結

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