Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice.
Patterns help you learn from other's successes, instead of your own failures.
Three categories of Design Patterns:
- Creational Patterns: deal with initializing and configuring classes and objects
- Structural Patterns: deal with decoupling the interface and implementation of classes and objects
- Behavioral Patterns: deal with dynamic interactions among societies of classes and objects
Creational Patterns:
Abstract Factory: Creates an instance of several families of classes
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Builder: Separates object construction from its representation
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Factory Method: Creates an instance of several derived classes
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Prototype: A fully initialized instance to be copied or cloned
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Singleton: A class of which only a single instance can exist
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Structural Patterns:
Adapter: Match interfaces of different classes
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Bridge: Separates an object’s interface from its implementation
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Composite: A tree structure of simple and composite objects
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Decorator: Add responsibilities to objects dynamically
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Façade: A single class that represents an entire subsystem
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Flyweight: A fine-grained instance used for efficient sharing
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Proxy: An object representing another object
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Behavioral Patterns:
Chain of Responsibility: A way of passing a request between a chain of objects
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Command: Encapsulate a command request as an object
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Interpreter: A way to include language elements in a program
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Iterator: Sequentially access the elements of a collection
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Mediator: Defines simplified communication between classes
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Memento: Capture and restore an object's internal state
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Observer: A way of notifying change to a number of classes
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State: Alter an object's behavior when its state changes
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Strategy: Encapsulates an algorithm inside a class
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Template Method: Defer the exact steps of an algorithm to a subclass
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Visitor: Defines a new operation to a class without change
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ref:
Design Patterns by Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides (also known as Gang of Four)
Huston Design Patterns - http://www.vincehuston.org/dp/
Thinking in Patterns with Java, by Bruce Eckel
Thinking in Patterns with C++, by Bruce Eckel