It really is difficult for me to guess your intention. On 1 hand you're stating that both a and b are public (no foremost underscore in their names) so I need to theoretically be allowed to access/mutate (get/set) both of those. But Then you certainly specify an explicit mutator only https://smartworldeveloper.in/smart-world-69-gurgaon-redefining-urban-luxury-living-in-sector-69/