Wait and notify in Java Multi-threading

(1) Wait:

1. Wait is a method of the object class, and sleep is a method of the thread class.

2. The thread that is currently accessing my object, wait.

3. Current this thread, locked in the current object of this thread stopped.

4. Wait only after locking; If it is not synchronized, call wait directly and make an error immediately.

(2) The problem of the lock:

　　1. Is it not the lock that owns this object? Once wait, immediately died, this object's lock no longer belongs to me all, only then woke up, I will find this lock again, bring it back.

(3) The difference between wait and sleep:

　　1. Wait time, the lock will not give me all.

2. Sleep, sleep also hold the lock, it is more greedy.

Wait and notify in Java Multi-threading