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9 Cards in this Set
- Front
- Back
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Factory |
We create object without exposing the creation logic to the client and refer to the newly created object using a common interface |
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Abstract factory |
Factory of factories. An interface is responsible for creating a factory of related objects without explicitly specifying their classes. Each generated factory can give the objects as per the factory pattern. |
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Singleton |
A single class responsible to create an object while making sure that only a single object gets created. Class provides access to the only object and doesn't need to instantiate the object of the class |
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Composite |
Treat a group of objects in a similar way as a single object. Tree structure of group of objects. Creates a class that contains group of its own objects and provides ways to modify them. |
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Proxy |
A class represents functionality of another class. We create objects having original object to interface its functionality to the outer world |
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Facade |
Hides complexities of the system and provides an interface to the client which can access the system. Involves a single class which provides simplified methods required by client and delegates calls to methods of existing system classes |
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Mediator |
Used to reduce communication complexities between multiple objects or classes. Provides a mediator class which normally handles all the communications between different classes and supports easy maintenance of code by loose coupling |
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Observer |
Used when there is a one to many relationship between objects such as if one object is modified, its dependent objects are to be notified automatically |
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Template |
An abstract class exposes defined ways/templates to execute its methods. It's subclasses can override the method implementation as per need but the invocation is to be the same way as defined by an abstract class |
