Design Pattern Basics

In Software Design- Design Patterns are reusable solutions to commonly occurring problems. The word “pattern” means if similar kind of problem occurs across multiple applications/in different situations, then this problem can be solved in a standard way. Each Design Pattern concentrates on a particular aspect of the problem.

Each Pattern consists of the following-

• The pattern name
• The Problem & Conditions to which it may be applied
• The Solution
• The Consequences

According to the uses and purposes Design Patterns are categorized into 3 areas.

• Creational Design Pattern- Handles the class object creation process or class instantiation
• Behavioral Design Pattern- Focuses on the object behavior and responsibility
• Structural Design Pattern- Focuses on the structure of different objects

Creational Patterns	Behavioral Patterns	Structural Patterns
Singleton	Chain of Responsibility	Adapter(Object/Class)
Simple Factory	Command	Bridge
Factory Method	Interpreter	Composite
Abstract Factory	Iterator	Decorator
Builder	Mediator	Facade
Prototype	Momento	Flyweight
	Observer	Proxy
	State
	Strategy
	Visitor
	Template

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