Creational Patterns

The Gamma book cites five creational patterns:

• Abstract factory (This provides an abstract way to ensure a common method of creation of objects, through an interface that all the factories have to implement)
• Builder (Creates an object which is specialisedin the construction of a complex from its representation)
• Factory Method (define an abstract method for creating object but let subclasses decide of the details of the implementation and instantiation)
• Prototype (objects are first created using a prototype instance which is copied in order to create new instances of this type)
• Singleton (a class may have only one instance, and some method to get this instance is clearly defined and unambiguous)