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Sun s J2EE Patterns
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Part I of the certification exam requires that you know the GoF Design Patterns only, but for Parts II and III, you may find it helpful to study and then include in your solution some of the J2EE Patterns from Sun. Although we do not go into great detail on these patterns, the next few sections will at least serve as an introduction by covering the scenarios for which they are potential solutions.
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You may nd it helpful to to the following web sites: http://java.sun. study and then include in your solutions com/reference/blueprints and http://java. some of the J2EE Patterns from Sun. For sun.com/blueprints/patterns/index.html. complete details on the J2EE Patterns, refer
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Identify the Most Appropriate Design Pattern
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SCENARIO & SOLUTION
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Given Scenario
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The system needs to be independent of how its objects are created, composed, and represented. The system needs to be configured with one of a multiple family of objects. The family of related objects is intended to be used together and this constraint needs to be enforced. You want to provide a library of objects that does not show implementations but only reveals interfaces. The algorithm for creating a complex object needs to be independent of the components that compose the object and how they are assembled. The construction process is to allow different representations of the constructed object. A class is not able to anticipate the class of objects it needs to create. A class wants its subclasses to specify the objects it instantiates. Classes delegate responsibility to one of several helper subclasses, and you want to localize the knowledge of which helper subclass is the delegate. The classes to instantiate are specified at runtime. You want to avoid building a class hierarchy of factories that parallels the hierarchy of objects. Instances of the class have one of only a few different combinations of state. A single instance of a class is needed, and it must be accessible to clients from a well-known access point. You want to utilize an existing class with an incompatible interface. You want to create a reusable class that cooperates with classes that don t necessarily have compatible interfaces. You need to use several existing subclasses but do not want to adapt their interfaces by subclassing each one. You want to avoid a permanent binding between the functional abstraction and its implementation. Both the functional abstraction and its implementation need to be extended using subclasses. Changes to the implementation should not impact the client (not even a recompile).
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Appropriate Design Pattern
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Abstract Factory
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Factory Method
Prototype
Singleton Adapter
Bridge
5: Design Patterns
SCENARIO & SOLUTION
Given Scenario
You want to represent a full or partial hierarchy of objects. You want clients to be able to ignore the differences between the varying objects in the hierarchy. The structure is dynamic and can have any level of complexity. You want to transparently and dynamically add responsibilities to objects without affecting other objects. You want to add responsibilities to an object that you may want to change in the future. Extending functionality by subclassing is no longer practical. You want to provide a simpler interface to a more complex subsystem. Several dependencies exist between clients and the implementation classes of an abstraction. You want to layer the subsystems. The application uses a considerable number of objects. The storage costs are high because of the quantity of objects. The application does not depend on object identity. You need a more versatile or sophisticated reference to an object, rather than a simple pointer. More than one object can handle a request and the handler is unknown. A request is to be issued to one of several objects and the receiver is not specified explicitly. The set of objects able to handle the request is to be specified dynamically. You need to parameterize objects by an action to perform. You specify, queue, and execute requests at different times. You need to support rollback, logging, or transaction functionality. The grammar of the language is not complicated and efficiency is not a priority. Access to a collection object is required without having to expose its internal representation. You need to support multiple traversals of objects in the collection. You need to provide a universal interface for traversing different structures in the collection.
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