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design patterns 6 170 lecture 18 notes fall 2005 reading chapter 15 of program development in java by barbara liskov 1 design patterns a design pattern is a standard solution ...
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...Design patterns lecture notes fall reading chapter of program development in java by barbara liskov a pattern is standard solution to common programming problem technique for making code more exible it meet certain criteria or implementation structure that achieves particular purpose high level idiom shorthand describing aspects organization connections among components the shape an object diagram model examples here are some which you have already seen each this list trying solve supplies and any disadvantages associated with software designer must trade o advantages against when deciding whether use tradeos between exibility performance as will often discover computer science other elds encapsulation data hiding exposed can be directly manipulated from outside leading violations representation invariant undesirable dependences prevent changing hide permitting only stylized access interface may not eciently provide all desired operations indirec tion reduce subclassing inheritance sim...