Static methods are NEVER overridden. Instead, if you define a static method with the same name, return type and parameters as is defined in a superclass, you will hide that method.
Because static methods cannot be overridden, they need to have an implementation. But interfaces do not allow implementation of methods.
If an interface would allow static methods, this would lead to a situation similar to a final abstract method - the method is abstract, but it can never be implemented.