Differences between static methods and non-static methods modified by class locks and Object locks and synchronized

When synchronized modifies a static method, a class lock (that is, the class itself, note: it is not an instance) is obtained under multiple threads ),

The scope of action is the entire static method, and the target object is all objects of this class.

When synchronized modifies a non-static method, the object lock (the Instance Object of the class) is obtained under multiple threads ),

The function scope is the entire method. The function object is the object that calls the method.

Conclusion: Different From Object locks, class locks do not produce mutual exclusion between them.

Differences between static methods and non-static methods modified by class locks and Object locks and synchronized