A、It is possible to synchronize static methods.

B、When a thread has yielded as a result of yield（）， it releases its locks.

C、When a thread is sleeping as a result of sleep（）， it releases its locks.

D、The Object.wait（） method can be invoked only from a synchronized context.

E、The Thread.sleep（） method can be invoked only from a synchronized context.

F、When the thread scheduler receives a notify（） request， and notifies a thread， that thread immediately releases its lock.