02 review multithreading

Threads have several States ?

public enum State {
    
      	// Freshmen 
        NEW,

        // function 
        RUNNABLE,

        // Blocking 
        BLOCKED,

        // wait for , Death etc. 
        WAITING,

        // Overtime waiting , It's overdue 
        TIMED_WAITING,

       // End 
        TERMINATED;
    }

Thread Inside State Enumeration types are 6 Kind of

wait/sleep The difference between

1. From different classes
wait=>Object
sleep=>Thread

2. About the release of the lock
wait Can release the lock
sleep It won't release the lock
3. The scope of use is different
sleep You can sleep anywhere
wait You have to synchronize the code block
4. Whether you need to catch exceptions
wait No need to catch exceptions

sleep You have to catch exceptions

3、Lock lock （ a key ）