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design. Additionally, hard-coding does not promote reuse and makes it difficult to keep track of errors. For these reasons, creational patterns are more useful than hard-coding behaviors. Creational patterns make design become more flexible. They provide different ways to remove explicit references in the concrete classes from the code that needs to instantiate them. In other words, they create independency for objects and classes.
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than class inheritance, emphasis shifts away from hard-coding behaviors toward defining a smaller set of basic behaviors that can be composed into more complex ones. Hard-coding behaviors are inflexible because they require overriding or re-implementing the whole thing in order to change parts of the
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Creational design patterns are further categorized into object-creational patterns and class-creational patterns, where object-creational patterns deal with object creation and class-creational patterns deal with class-instantiation. In greater details, object-creational patterns defer part of its
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in a manner suitable to the situation. The basic form of object creation could result in design problems or in added complexity to the design due to inflexibility in the creation procedures. Creational design patterns solve this problem by somehow controlling this object creation.
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The creational patterns aim to separate a system from how its objects are created, composed, and represented. They increase the system's flexibility in terms of the what, who, how, and when of object creation.
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Below is a simple class diagram that most creational patterns have in common. Note that different creational patterns require additional and different participated classes.
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Creational design patterns are composed of two dominant ideas. One is encapsulating knowledge about which concrete
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Freeman, Eric; Freeman, Elisabeth; Sierra, Kathy; Bates, Bert (2004). Hendrickson, Mike; Loukides, Mike (eds.).
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Freeman, Eric; Freeman, Elisabeth; Sierra, Kathy; Bates, Bert (2004). Hendrickson, Mike; Loukides, Mike (eds.).
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Freeman, Eric; Freeman, Elisabeth; Sierra, Kathy; Bates, Bert (2004). Hendrickson, Mike; Loukides, Mike (eds.).
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object creation to another object, while class-creational patterns defer its object creation to subclasses.
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Hiding the implementations of a class library or product, revealing only their interfaces.
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There must be a single instance and client can access this instance at all times.
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Five well-known design patterns that are parts of creational patterns are the
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A system should be independent of how its objects and products are created.
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Gamma, Erich; Helm, Richard; Johnson, Ralph; Vlissides, John (1995).
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Gamma, Erich; Helm, Richard; Johnson, Ralph; Vlissides, John (1995).
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Gamma, Erich; Helm, Richard; Johnson, Ralph; Vlissides, John (1995).
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Gamma, Erich; Helm, Richard; Johnson, Ralph; Vlissides, John (1995).
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Constructing different representation of independent complex objects.
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A class wants its subclass to implement the object it creates.
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A set of related objects is designed to be used together.
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Some examples of creational design patterns include:
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Instance should be extensible without being modified.
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of these concrete classes are created and combined.
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Software design pattern dealing with object creation
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The class instantiations are specified at run-time.
239:: restrict instantiation of a class to one object
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112:As modern software engineering depends more on
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120:Consider applying creational patterns when:
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175:: Declares object interface. Returns object.
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181:: Implements object's interface.
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1022:Mock object
884:Interceptor
854:Thread pool
769:Concurrency
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250:Constructor
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