63 lines
3.1 KiB
Markdown
63 lines
3.1 KiB
Markdown
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#Design pattern samples in Java.
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##Abstract Factory
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**Intent:** Provide an interface for creating families of related or dependent objects without specifying their concrete classes.
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##Builder
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**Intent:** Separate the construction of a complex object from its representation so that the same construction process can create different representations.
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##Factory Method
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**Intent:** Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.
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##Prototype
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**Intent:** Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype.
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##Singleton
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**Intent:** Ensure a class only has one instance, and provide a global point of access to it.
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##Adapter
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**Intent:** Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.
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##Bridge
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**Intent:** Decouple an abstraction from its implementationso that the two can vary independently.
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##Composite
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**Intent:** Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.
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##Decorator
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**Intent:** Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.
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##Facade
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**Intent:** Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.
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##Flyweight
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**Intent:** Use sharing to support large numbers of fine-grained objects efficiently.
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##Proxy
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**Intent:** Provide a surrogate or placeholder for another object to control access to it.
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##Chain of responsibility
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**Intent:** Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it.
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##Command
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**Intent:** Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
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##Interpreter
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**Intent:** Given a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language.
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##Iterator
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**Intent:** Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation.
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##Mediator
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**Intent:** Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently.
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##Memento
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**Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
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##Observer
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**Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
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