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19 Cards in this Set
- Front
- Back
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Design Pattern
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A description of a problem and its solution that you can apply to many similar programming situations
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What is the Strategy Pattern
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Defines a family of algorithms, encapsulates each one, and makes them interchangeable. AKA: Algorithim a box.
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What class implements the strategy pattern.
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The LayoutManager
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What is the Observer Pattern?
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A one-to-many dependency between objects so that when one object changes state, all of its dependents are notified and updated automatically.
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What Uses the Observer Pattern.
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JTrees
Model-View-Controller |
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Explain the three components of the Model-View-Controller
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Model - data structure, no visual representation
View - visual representation Controller - event handlers |
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What is the Factory Pattern?
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A class that makes objects.
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What's the use of the factory pattern?
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Prevents misuse/improper construction
Hides Construction Provides API Convenience One stop shop for getting an object of a family type The programmer never needs to know about the actual class/type |
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What Objects do factories make?
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Common Ancestor
Same Apparent Type Different Actual Type |
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What class uses the factory pattern?
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BorderFactory use the Factory Pattern by creating Border Objects
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What is the Singleton Pattern
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Defines a type where only one object of that type may be constructed. By making the constructor private.
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What makes a good singleton class.
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Central app organizer class
Something everybody needs Fully static classes |
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What is Command Abstraction?
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We want to link all similar events to the same listener?
Information concerning the command can be abstracted to a separate command object |
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We did not use the command pattern for handlers. What did we do instead.
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We made separate event handlers for each type interaction
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What is the Fly Weight Pattern
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Allows one object to be used to represent many identical instances.
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A Flyweight must be ________.
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Immutable
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What is the Iterator Pattern
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Iterates over a group of objects without revealing the detains of how the items are obtained.
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What is the State Pattern?
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Dynamically changes the representation of an object.
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State Pattern is only used on ________.
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Mutable Objects
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