functions

memberFunctions

declaredFunctions

declaredMemberFunctions

Math::class.functions.size // 85 here
Math::class.declaredFunctions.size // 82 declared on the class itself (not just inherited)
Math::class.memberFunctions.size // 3, all the rest are Java static methods
Math::class.declaredMemberFunctions.size // 0, no instance methods declared on the class itself (as this Java class is not meant to be instantiated)