Hello, I read your degree(S)!! really how could u manage to pass all these exams ?! If u are in india i would love to meet u. I have one query since long time i think u can give proper answer. pl. help if possible. Q: what are the benifits of subclassing data class ? (Actually they says u should show benifis of both alterantive and then explain why u selected particular one.) So can u pl. tell me theory + for our case "benifis of subclassing ?" (regardless of our choice) I hope u will solve my prob. thanks reena K.