Object-Oriented Design and Programming for Medium-Sized Projects

1. CPS 108 • Object oriented design and programming of medium-sized projects in groups using modern tools and practices in meaningful ways • High level OO concepts • XP: Extreme Programming: simplicity, refactor, grow code • Tell, don't ask: designing classes • Open/Closed: open to extension, closed to modification • Learn to manage time, improve coding methods, e.g., can you really code effectively at 3:00 am?

2. Essential Design Patterns (by name) • MVC, aka Observer/Observable • Separate concerns, especially important for GUIs • Composite • Container is/contains JComponent: File/Directory • Factory • Separate creation from class, install new creators • Proxy/Adapter • Stand-in with same interface, adapt interface as needed • Decorator • Is-a and Has-a, e.g., Filters and java I/O • Command • Function/request object, undoable action

3. Patterns continued • Singleton • Enforce single point of creation, conserve resources • Template method • Hooks filled in by sublcasses • Iterator • Common from previous courses, essential in Java • Strategy • Human player, AI, change algorithm • Forces in a problem lead to solution via appropriate pattern • Should know what GOF is: gang of four

4. Something old, something new • CPS 108 has used Java since 1996 always with C++ • Before ’96 used Tcl/Tk or Python • Starting with Java is problematic, what to read? • What if 6/100 move to Java? • Is Unix an issue? More time with Windows programming environments? Linux or Mac? • Eclipse as cross-platform environment • What about groups? • 110 model, keep same group always • 108 model, chaotic? Re-randomize? Always choice?

5. OOGA • Architectural issues important, leverage a good system-level architecture into easier-to-develop games/programs • Ambitious groups can get away without an architecture, but a good architecture really helped ease development • MVC really worked, better than in the past? • Networking comes too late? Not next time? • Should require an AI for some games, talk about this or provide code? • Card games would also be architecturally interesting • Solitaire? Other games? Build on freecell?

6. Need smaller programs ? Mastery projects? C++ inheritance, templates, low-level C, sockets Java GUI, threads, web, network Success: OOGA, Freecell (kind of) Failure: Hyperwag Success: Set your own standards, don’t meet my requirements Failure: Reading about software, aesthetics, ethics, … Failure: feedback Success: coding examples, MVC Failure: feedback Success/Failure: understanding group dynamics Failure: coding standards Failure: using books Success: pattern examples Failure: pattern re-use Success: tell don't ask Overall grade: _______ Post-mortem evaluation

7. Why is programming fun? What delights may its practitioner expect as a reward? First is the sheer joy of making things Second is the pleasure of making things that are useful Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts Fourth is the joy of always learning Finally, there is the delight of working in such a tractable medium. The programmer, like the poet, works only slightly removed from pure thought-stuff. Fred Brooks

8. Fred Brooks • … on computing pioneer Howard Aiken "the problem was not to keep people from stealing your ideas, but to make them steal them." • Duke valedictorian 1953, started UNC Computer Science Dept in 1964, won Turing Award in 1999 • Mythical-Man Month, "Adding man-power to a late project makes it later", … "There is no silver-bullet for Software Engineering… [because of essential complexity]" • Chaired Executive Committee of the Central-Carolina Billy Graham Crusade in 1973