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A sample UML class diagram for the adapter design pattern. [5] In the above UML class diagram, the client class that requires a target interface cannot reuse the adaptee class directly because its interface doesn't conform to the target interface. Instead, the client works through an adapter class that implements the target interface in terms ...
An example of active object pattern in Java. [4] Firstly we can see a standard class that provides two methods that set a double to be a certain value. This class does NOT conform to the active object pattern.
The mechanisms for modular or object-oriented programming that are provided by a programming language are mechanisms that allow developers to provide SoC. [4] For example, object-oriented programming languages such as C#, C++, Delphi, and Java can separate concerns into objects, and architectural design patterns like MVC or MVP can separate presentation and the data-processing (model) from ...
All details of storage are hidden from the rest of the application (see information hiding). Unit testing code is facilitated by substituting a test double for the DAO in the test, thereby making the tests independent of the persistence layer. In the context of the Java programming language, DAO can be implemented in various ways. This can ...
What solution does the Facade design pattern describe? Define a Facade object that implements a simple interface in terms of (by delegating to) the interfaces in the subsystem and; may perform additional functionality before/after forwarding a request. This enables to work through a Facade object to minimize the dependencies on a subsystem.
Decorator UML class diagram. The decorator pattern can be used to extend (decorate) the functionality of a certain object statically, or in some cases at run-time, independently of other instances of the same class, provided some groundwork is done at design time.
Computer science commonly presents levels (or, less commonly, layers) of abstraction, wherein each level represents a different model of the same information and processes, but with varying amounts of detail. Each level uses a system of expression involving a unique set of objects and compositions that apply only to a particular domain.
A class delegates state-specific behavior to its current state object instead of implementing state-specific behavior directly. This makes a class independent of how state-specific behavior is implemented. New states can be added by defining new state classes. A class can change its behavior at run-time by changing its current state object.