Design Patterns I

What are Design Patterns?

Design patterns are general reusable solutions to common problems that occur in software design. They are not a finished design that can be transformed directly into code. They are a description or template for how to solve a problem that can be used in many different situations.

Types of Design Patterns

Design patterns can be classified into three categories:

• Creational Patterns: TProvide various object creation mechanisms, which increase flexibility and reuse of existing code.
• Structural Patterns: Explain how to assemble objects and classes into larger structures while keeping these structures flexible and efficient.
• Behavioral Patterns: Concerned with algorithms and the assignment of responsibilities between objects.

List of Design Patterns

• Creational Patterns
  • Singleton
  • Factory Method
  • Abstract Factory
  • Builder
  • Prototype
• Structural Patterns
  • Adapter
  • Bridge
  • Composite
  • Decorator
  • Facade
  • Flyweight
  • Proxy
• Behavioral Patterns
  • Chain of Responsibility
  • Command
  • Iterator
  • Mediator
  • Memento
  • Observer
  • State
  • Strategy
  • Template Method
  • Visitor

References

• Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides
• Head First Design Patterns by Eric Freeman, Elisabeth Robson, Bert Bates, Kathy Sierra
• Refactoring Guru - Design Patterns for Humans