Design Patterns are essential for any organization that wants to identify recurring patterns in their software environment. The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. Here you will find information on these important patterns. If a problem occurs over and over again, a solution to that problem has been used and is described as a pattern. The design patterns are language-independent strategies for solving common object-oriented design problems. When you make a design, you should know the names of some common solutions. Learning design patterns is good for people to communicate each other effectively. In fact, you may have been familiar with some design patterns, you may not use well-known names to describe them.
How do behavioral design patterns differentiate themselves from behavioral and creational patterns?
Design patterns are commonly categorized into three types: Creational, Structural, and Behavioral. Each of these categories serve different purposes and solve distinct types of design problems.
- Creational Design Patterns deal primarily with object creation mechanisms, trying to create objects in a manner suitable to the situation. The basic form of object creation could result in design problems or add complexity to the design. Creational design patterns solve this problem by controlling this object creation process. Examples of Creational design patterns are Singleton, Builder, Prototype, Factory Method, and Abstract Factory.
- Structural Design Patterns concern class and object composition. They use inheritance to compose interfaces and define ways to compose objects to obtain new functionality. These patterns are about organizing different classes and objects to form larger structures and provide new functionality. Examples of Structural Design Patterns are Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy.
- Behavioral Design Patterns are concerned with algorithms and the assignment of responsibilities between objects. These patterns characterize complex control flow that's difficult to follow at run-time. They shift your focus away from flow of control to let you concentrate just on the way objects are interconnected. Behavioral patterns are those patterns that are most specifically concerned with communication between objects. Examples of Behavioral design patterns are Observer, State, Strategy, Template Method, Visitor, Chain of Responsibility, Command, Interpreter, Iterator, Mediator, and Memento.
While creational patterns focus on the instantiation process of objects, providing a way to decouple the client from the objects it needs to instantiate, and structural patterns deal with the composition of classes or objects, behavioral patterns focus on improving the communication between disparate objects in a system.
Behavioral design patterns provide flexibility in terms of object communication, roles, and responsibilities. They enhance flexibility in how objects collaborate and distribute responsibility. Each pattern describes a communication process and the role assignments a designer may make to arrive at the final design. They not only describe patterns of communication, but they also distribute responsibilities and manage dependencies. These patterns capture the subtle nuances of complex object collaboration, helping to manage and mitigate potential issues with object interaction.
By comparison, Creational patterns deal with object creation mechanisms, trying to create objects in a manner suitable to the situation, allowing for more flexibility and control over the instantiation process. Structural patterns, on the other hand, concern themselves with the composition of classes or objects, allowing for more complex structures to be built from simpler, more manageable components.
In conclusion, behavioral design patterns distinguish themselves by focusing on the communication between objects and how objects are assigned responsibilities within a system, providing a contrast to the creation focus of Creational patterns and the composition focus of Structural patterns.
The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns.
They are categorized in three groups:
- Structural, and
Design patterns are recurring solutions to software design problems you find again and again in real-world application development.
Patterns are about design and interaction of objects, as well as providing a communication platform concerning elegant, reusable solutions to commonly encountered programming challenges.