Object-Oriented Design

Identifying Operations (or Responsibilities)

• Identify what can be done to objects.     or
• Identify what objects can do for themselves.     or
• Identify who is responsible for doing what.
• Terminology: operations, responsibilities, contracts, message passing, encapsulation, data hiding
  Example: BlackJack Program
  • Card: display, report value (report suit? maybe internally) (modify value/suit? or set these in constructor only?)
  • Deck: shuffle, deal next card, report how many cards left in deck
  • Dealer: deal cards, add card to hand, show (sometimes partial) hand, calculate (partial) hand value, number of cards in hand, hit?, determine winner, reset hand
  • Player: add card to hand, show hand, calculate hand value, number of cards in hand, hit?, reset hand