Can a synchronized static method cause a class level lock?

If a class A is having a public static method which is tagged by 'synchronized' keyword, then Is there a possibility 开发者_C百科to have class level lock?

When there is a lock in such class, Can We instantiate object of that class or it has nothing to do with instantiation?

If a class A is having a public static method which is tagged by 'synchronized' keyword, then Is there a possibility to have class level lock?

Yes, there would be a class level lock on class A.

When there is a lock in such class, Can We instantiate object of that class or it has nothing to do with instantiation?

When there is a lock on a static method, it only affects other synchronized static methods. You can still create a new instance of that class.

Yes, the lock will be maintained on the Class object.

Quoted from Locks In Synchronized Methods

You might wonder what happens when a static synchronized method is invoked, since a static method is associated with a class, not an object. In this case, the thread acquires the intrinsic lock for the Class object associated with the class. Thus access to class's static fields is controlled by a lock that's distinct from the lock for any instance of the class.

All the other threads trying to execute another static synchronized method of the same class, or any other method synchronized on this Class instance will be blocked.