Difference sleep () and wait () method

1, sleep () statement in the Thread class and a static method;

wait () statement in the Object class, and must be called by the lock object.

2, sleep after () time to reach recovery;

wait () can be set to automatically restore the event, if no time has to be woken up by notfiy;

3, sleep () does not cause the thread to lose lock;

wait () causes the current thread to lose the lock, so that other thread synchronization code block or synchronization method is executed.

 

 

java.lang.Object class way:

(1) wait (): wait

(2) notify () / notifyAll (): wake

They must be called by the "lock / Object Monitor", otherwise it will error.

 

Thread of the life cycle

Point one:

1, New: create a thread object, yet start

2, ready: already started, and can be CPU scheduling

3, run: being scheduled

4, blocking: met: sleep (), wait (), wait (time), the other thread join (), join (time), suspend (), the lock is occupied by other threads, etc.

Back to unblock ready state: sleep () time, notify (), wait time to, the end of the thread stopper, stopper to time, resume (), the other thread holding the lock release the lock.

5, death: run () ends normally encountered an unhandled exception or error, stop ()

Second point:

1, New NEW: create a thread object, yet start

2, run RUNNABLE: CPU can be scheduled, or is scheduled

3, blocked BLOCKED: wait for the lock

4, wait WAITING: wait (), join () and so there is no set time, etc. must notify (), or stoppered end of the thread to resume

5, there is time to wait TIMED_WAITING: sleep (time), wait (time), join (time) and so have time blocking, so time to recover, or interrupt will be restored

6, termination TERMINATED: run () ends normally encountered an unhandled exception or error, stop ()

 

Thread dies, wait () releases the locks

sleep () and yield () does not release the lock