Abstract factory

The abstract factory pattern provides a way to encapsulate a group of individual factories that have a common theme.

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Factory method

the Factory method pattern deals with the problem of creating objects (products) without specifying the exact class of object that will be created.

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Builder pattern

The Builder pattern separate the construction of a complex object from its representation so that the same construction process can create different representations

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Prototype pattern

Prototype pattern is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects

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More examples

• Lazy initialization pattern is the tactic of delaying the creation of an object, the calculation of a value, or some other expensive process until the first time it is needed
• Object pool is a set of initialised objects that are kept ready to use, rather than allocated and destroyed on demand
• Singleton pattern restrict instantiation of a class to one object

Adapter pattern

The adapter pattern adapts one interface for a class into one that a client expects

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  Using delegation
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  Using inheritance

Bridge pattern

The bridge pattern decouple an abstraction from its implementation so that the two can vary independently.

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Composite pattern

The composite pattern is a tree structure of objects where every object has the same interface.

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More examples

• Java Design Patterns Learning Design Patterns
• w:Aggregate pattern: a version of the Composite pattern with methods for aggregation of children
• w:Decorator pattern: add additional functionality to a class at runtime where subclassing would result in an exponential rise of new classes
• w:Extensibility pattern: aka. Framework - hide complex code behind a simple interface
• w:Facade pattern: create a simplified interface of an existing interface to ease usage for common tasks
• w:Flyweight pattern: a high quantity of objects share a common properties object to save space
• w:Proxy pattern: a class functioning as an interface to another thing
• w:Pipes and filters: a chain of processes where the output of each process is the input of the next
• w:Private class data pattern: restrict accessor/mutator access

Strategy pattern

The strategy pattern defines a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from clients that use it.

Template method pattern

The template method pattern describes the program skeleton of a program in an operation, deferring some steps to subclasses.

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More examples

• w:Chain of responsibility pattern: Command objects are handled or passed on to other objects by logic-containing processing objects
• w:Command pattern: Command objects encapsulate an action and its parameters
• w:Interpreter pattern: Implement a specialized computer language to rapidly solve a specific set of problems
• w:Iterator pattern: Iterators are used to access the elements of an aggregate object sequentially without exposing its underlying representation
• w:Mediator pattern: Provides a unified interface to a set of interfaces in a subsystem
• w:Memento pattern: Provides the ability to restore an object to its previous state (rollback)
• w:Null Object pattern: designed to act as a default value of an object
• w:Observer pattern: aka Publish/Subscribe or Event Listener. Objects register to observe an event which may be raised by another object
• w:State pattern: A clean way for an object to partially change its type at runtime
• w:Specification pattern: Recombinable Business logic in a boolean fashion
• w:Visitor pattern: A way to separate an algorithm from an object
• w:Single-serving visitor pattern: Optimise the implementation of a visitor that is allocated, used only once, and then deleted