執行緒的6種狀態以及轉變：
java的執行緒一共6種狀態。具體程式碼見：
java.lang.Thread.State
複製程式碼1 NEW
新建狀態 Thread state for a thread which has not yet started. 執行緒還沒有呼叫start的時候
2 RUNNABLE
可執行狀態 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. 呼叫start之後，jvm啟動了這個任務，但是可能被其他資源佔用執行緒變成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}. 執行緒被鎖的時候，執行緒等待進去一個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()
執行緒呼叫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帶時間引數等方法時
6 TERMINATED
終止狀態 Thread state for a terminated thread. The thread has completed execution. 執行緒執行完成 或者被中斷的時候變成TERMINATED TERMINATED;
執行緒建立出來就是new的狀態。
start方法呼叫之後狀態變成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
如果呼叫wait或者join的方法，則變成waiting狀態，
如果呼叫帶時間引數的wait或者join,則變成time_waiting。