A comprehensive guide to understanding and implementing essential design patterns in Java.
This repository is a practical guide to learning and implementing some of the most widely used design patterns in Java. Each pattern includes a detailed explanation, UML diagram, and Java code example, making it easy to understand and integrate into your own projects.
Design patterns are standardized solutions to common problems in software design, helping developers write code that is robust, flexible, and easier to maintain. This repository provides a hands-on guide to various design patterns implemented in Java. Each pattern includes:
- A brief description of its purpose.
- A UML diagram illustrating its structure.
- A practical Java example demonstrating its implementation.
The guide covers design patterns in three main categories:
These patterns simplify object creation, enhancing flexibility and reusability.
| Pattern | Description | Status |
|---|---|---|
| Singleton | Ensures only one instance of a class exists. | ✅ |
| Factory Method | Provides an interface for creating instances of related classes. | ✅ |
| Abstract Factory | Creates families of related objects without specifying exact classes. | ✅ |
| Builder | Builds complex objects step-by-step. | 🟡 |
| Prototype | Creates new objects by copying an existing instance. | 🟡 |
These patterns deal with object composition, helping to create large structures with improved relationships.
| Pattern | Description | Status |
|---|---|---|
| Adapter | Enables incompatible interfaces to work together. | 🟡 |
| Bridge | Decouples abstraction from implementation. | 🟡 |
| Composite | Represents part-whole hierarchies with tree structures. | 🟡 |
| Decorator | Adds functionality to objects dynamically. | 🟡 |
| Facade | Simplifies complex system interactions with a single interface. | 🟡 |
| Flyweight | Shares data to minimize memory use. | 🟡 |
| Proxy | Controls access to an object, providing a placeholder. | 🟡 |
Behavioral patterns manage object interactions and communication, making systems flexible and responsive.
| Pattern | Description | Status |
|---|---|---|
| Chain of Responsibility | Passes requests along a chain of handlers. | 🟡 |
| Command | Encapsulates requests as objects. | 🟡 |
| Interpreter | Provides a way to interpret custom language grammars. | 🟡 |
| Iterator | Sequentially accesses elements of a collection. | 🟡 |
| Mediator | Simplifies complex object communication. | 🟡 |
| Memento | Captures and restores an object's state. | 🟡 |
| Observer | Notifies dependent objects of state changes. | 🟡 |
| State | Alters object behavior based on its internal state. | 🟡 |
| Strategy | Allows for interchangeable algorithms in an operation. | 🟡 |
| Template Method | Defines steps of an algorithm, allowing customization. | 🟡 |
| Visitor | Adds operations to classes without modifying them. | 🟡 |