Sketchy class — bank account
Inheritance + composition with rounded boxes.
Rendering…
Make it your own.
[<abstract>Account|+id;+owner|deposit();withdraw();balance()]
[CheckingAccount|+overdraft]
[SavingsAccount|+rate]
[Bank|+name|open();close()]
[Transaction|+id;+amount;+ts]
[Account]<:-[CheckingAccount]
[Account]<:-[SavingsAccount]
[Bank]o-*[Account]
[Account]+-*[Transaction]