Design Patterns Implemented in Java

Learning design patterns with Java.

Introduction

Design patterns are formalized best practices that help solve common problems in software design. These patterns represent proven solutions that improve code readability, flexibility, and scalability by following principles of object-oriented design. They are categorized into three main types:

1. Creational Patterns

These patterns provide ways to create objects while hiding the creation logic, rather than instantiating objects directly. This approach enhances flexibility in terms of object creation and allows for more efficient memory management. Examples include:

• Singleton: Ensures only one instance of a class exists.
• Factory Method: Defines an interface for creating objects, but allows subclasses to alter the type of objects created.
• Builder: Constructs complex objects by separating their representation from the creation process.

2. Structural Patterns:

These patterns focus on object composition and relationships between objects, making it easier to develop structures that are flexible and efficient. Examples include:

• Adapter: Allows incompatible interfaces to work together.
• Decorator: Adds new functionality to an object dynamically.
• Composite: Combines objects into tree-like structures to represent part-whole hierarchies.

3. Behavioral Patterns:

These patterns are concerned with communication between objects, focusing on the flow and control of data. Examples include:

• Observer: Defines a one-to-many relationship so that when one object changes, all dependents are notified.
• Strategy: Enables selecting an algorithm's behavior at runtime.
• Command: Encapsulates a request as an object, allowing for parameterization of clients with different requests.

Project Overview

In this repository, I’ll be implementing these design patterns in Java, with examples and testing for each pattern. The goal is to provide a practical understanding of each pattern's purpose, usage, and benefits in real-world applications.

Repository Structure

The repository is organized as follows:

• /src: Contains Java classes and implementations for each design pattern.
  • creational: Creational pattern implementations
  • structural: Structural pattern implementations
  • behavioral: Behavioral pattern implementations