If a subclass defines a static method with the same signature as a static method in the superclass, then the method in the subclass hides the one in the superclass.

• The version of the overridden instance method that gets invoked is the one in the subclass.
• The version of the hidden static method that gets invoked depends on whether it is invoked from the superclass or the subclass.

　　ref:　　java

static 方法.