CS 47/147 Advanced Object-Oriented Programming - Caltech

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The Object Motto“Ask not first what the system does: askwhat it does it to.” [Meyer][Meyer] Bertrand Meyer. Object-Oriented Software Construction, Second ed. Prentice-Hall PTR, 1997.8
Data Model• Identifies the “types” of data the program manipulates.• Defines relationships between objects.• So far, data in specs have mostly been simple.Numbers; strings; sequences; sets.Basic data types or simple math concepts.• Real systems work with more complex kinds of things.Files, directories (filesystem example);Stock portfolios/positions/quotes (stock tracker example);Products/orders/shipments/inventory (commerce); etc.• Data model describes these complex sets semi-formally.9
Page 2 and 3: CS 3Introduction to Software Engine
Page 4 and 5: Last Time: Requirements Analysis•
Page 6 and 7: From Requirements to Design• Soft
Page 10 and 11: Elements of a Data Model• Diagram
Page 12 and 13: Book Example: File System• Basic
Page 14 and 15: Book Example: File System• Files
Page 16 and 17: Book Example: File System• A dire
Page 18 and 19: Book Example: File System!FSObjectR
Page 21 and 22: Operations• As for a data abstrac

CS 47/147 Advanced Object-Oriented Programming - Caltech

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