A Simple OO Design Task

Task

Extract the "isa" (class, inheritance), "has" (attributes), "uses" (asssociations), and "does" (methods) in the following design.

• Persons have up to 4 employees. Owners can own several cars. Cars can be financed by several loans. Banks loan to persons, companies, and other banks
• The current procedural design follows. Max it "OO". Hints: replace pointers with associations; get multiplicities right; eliminate IDs; ?? add classes.
  • "Person": name age employer 1 ID employer 2 ID employer 3 ID person ID address
  • "Car": owner ID vehicle ID owner type model year
  • "CarLoan": vehicle ID customer type customer ID account number band ID interest rate current balance
  • "Company": name company ID
  • "Bank": name bank ID

Solution

Comments

• Persons have < 4 employees: ignored (? artificial).
• Account number left in: why?
• Any extra sub-classing we can do?
• Are any relationships redundant?