이 레슨은 당분간 영어로 제공돼요.
Is-a or has-a?
Some types are special versions of others: a like notification is a notification. Others are built from parts: a game has a leaderboard. Inheritance models the first relationship, composition the second.
이 레슨은 당분간 영어로 제공돼요.
Some types are special versions of others: a like notification is a notification. Others are built from parts: a game has a leaderboard. Inheritance models the first relationship, composition the second.