Design patterns are reusable solutions to common problems in software design. They provide a proven and efficient way to solve complex problems, making it easier for developers to write better code. By Akash Pandey.
This guide explains 15 key design patterns in Java, grouped into three main categories
| Pattern Type | Key Benefits | Best Use Cases |
|---|---|---|
| Creational | Reduces object creation overhead, increases flexibility, and improves code organization. | Singleton, Factory Method, Abstract Factory, Builder |
| Structural | Improves code modularity, reduces coupling, and enhances maintainability. | Adapter, Bridge, Composite, Decorator |
| Behavioral | Facilitates loose coupling, promotes polymorphism, and simplifies interactions between objects. | Observer, Template Method, Strategy, Command |
And here are the 15 design patterns explained with concise examples in Java:
- Singleton: Ensures only one instance of a class exists
- Factory Method: Creates objects without specifying their concrete type
- Observer: Allows objects to notify others about changes
- Decorator: Adds new behavior to an existing object
- Adapter: Converts between incompatible interfaces
- Template Method: Defines the skeleton of an algorithm
- Abstract Factory: Provides a way to create families of related objects
- Builder: Separates object construction from its representation
- Prototype: Creates new objects by copying existing ones
- Bridge: Separates abstraction and implementation
- Composite: Represents a part-whole relationship
- Facade: Simplifies complex interactions with an API
- Flyweight: Reduces memory usage by sharing instances
- Command: Encapsulates actions as objects
- Strategy: Defines a family of algorithms
By understanding these essential design patterns, you’ll be better equipped to tackle complex software development challenges. Good read!
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