9.4.2 Overloading

If two methods of an interface (whether both declared in the same interface, or both inherited by a interface, or one declared and one inherited) have the same name but different signatures, then the method name is said to be overloaded. This fact causes no difficulty and never of itself results in a compile-time error. There is no required relationship between the return types or between the throws clauses of two methods with the same name but different signatures.