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Design Patterns for Object Oriented systems CSC 515 Ashwin Dandwate
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What are Design Patterns A Mechanism Capture the intent behind a design Provide common vocabulary, Reduce system complexity, a base for building reusable software. Describe how to express and organize object oriented systems
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Categorizing Design Pattern
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Class Jurisdiction
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Class Creational Defers some part of object creation to subclasses. example - The Factory Method an abstract method that is called by a base class but defined in subclasses.
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Class Structural using inheritance to compose protocols or code example – The Adapter pattern Multiple Inheritance - to mix two or more classes into one.
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Class Behavioral classes cooperation with their subclasses Example- the Template method provides an abstract definition of an algorithm The subclass must implement specific behavior to provide the services required by the algorithm
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Object Jurisdiction
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Object Creational Creational object patterns abstract how sets of objects are created Example- Scrollbar
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Object Structural ways to assemble objects to realize new functionality Example- The Flyweight pattern concerned with object sharing Saves $$$
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Object Behavioral Peer objects cooperate to perform a task that no single object can carry out by itself.
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Compound Jurisdiction
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Compound Creational concerned with the creation of recursive object structures Example - Builder pattern
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Compound Structural capture techniques for structuring recursive object structures Example - Composite pattern
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Compound Behavioral deal with behavior in recursive object structures Examples – Trees, LinkedList, Hash Table all need to be iterated with Search, Sort and Next.
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Summary motivate developers to go beyond concrete object Design patterns improves design Effective way to teach object-oriented design by example particularly suited to reuse Reduce the effort required to learn a class library
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References Jia, Object-oriented software development using java(2005) www.wikipedia.org Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides, Design Patterns (2000)
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