多线程重要概念（一）

All objects automatically contain a single lock (also referred to as a monitor). When you call?

any synchronized method, that object is locked and no other synchronized method of?

that object can be called until the first one finishes and releases the lock. For the preceding?

methods, if f( ) is called for an object by one task, a different task cannot call f( ) or g( ) for?

the same object until f( ) is completed and releases the lock. Thus, there is a single lock that?

is shared by all the synchronized methods of a particular object, and this lock can be used?

to prevent object memory from being written by more than one task at a time. ?

Note that it’s especially important to make fields private when working with concurrency;?

otherwise the synchronized keyword cannot prevent another task from accessing a field?

directly, and thus producing collisions. ?