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Design patterns in Java provide proven solutions to recurring software design problems.
The goal of this series is to help readers develop a solid understanding of these patterns while also sharing real-world examples from actual codebases that make use of these patterns.
How to use this guide
- New to design patterns? Start with creational patterns like Singleton and Factory.
- Experienced developer? Jump directly to patterns you encounter in frameworks and JDK internals.
- Want references? Use these articles to jump back to the coding templates and use cases.
Breakdown of Each Article
Each article is broken down into a few sections for better readability. This section includes:
- Introduction
- Recipe to cook a pattern in your code
- Use Case
- Pitfalls
- Real World code examples
Creational Design Patterns in Java
Creational design patterns in Java focus on solving object creation problems in a clean, flexible, and reusable way. As applications grow in complexity, managing how objects are created becomes just as important as how they behave. This is where design patterns in Java play a critical role by providing proven solutions to common instantiation challenges.
Singleton Design Pattern
The Singleton pattern is one of the quirkiest and most trivial patterns in existence. This pattern was created to fulfill the need for a single, one-time instantiation of an object that is shared among multiple components.
Builder Design Pattern
The Builder pattern helps create complex objects step-by-step while keeping them immutable and enforcing any required rules. It avoids messy constructors, makes code more readable, and is perfect when you have both required and optional fields.
Prototype Design Pattern
The Prototype Design Pattern is a creational pattern that lets us create new objects by cloning existing ones instead of instantiating them from scratch.
Singleton Design Pattern
The Factory pattern is the second most commonly used design pattern. It is based on the idea that we can create objects of a common super type, while allowing their actual implementations to differ in subsequent subclasses.
Structural Design Pattern
Structural Design Patterns in Java are an essential category of design patterns in Java that focus on how classes and objects are composed to form larger, flexible structures. These patterns help simplify complex relationships between components, improve code maintainability, and promote loose coupling in software systems.
Adapter Design Pattern
Adapter pattern enables integration of new interfaces with existing implementations, allowing reuse of legacy code without rewriting them for newer interfaces.
Composite Design Pattern
The Composite Design Pattern allows objects to be organized in a tree hierarchy, enabling uniform treatment of individual and grouped elements.
Facade Design Pattern
The Facade Design Pattern simplifies complex systems by providing a unified interface. It hides intricate operations behind a clean layer, making code easier to use, maintain, and extend without exposing internal details.
Proxy Design Pattern
The Proxy pattern provides a substitute for another object, controlling access and allowing additional functionality before or after requests reach the original object; useful for lazy loading, security, and resource management.
Decorator Design Pattern
The Decorator Design Pattern allows us to attach additional responsibilities to an object at runtime while keeping the original object unchanged. In other words, the pattern promotes flexible behavior extension without subclassing.
Flyweight Design Pattern
The Flyweight pattern is one of the most resource-conscious patterns in existence. While the Singleton pattern was created to ensure a single instance of a class exists, the Flyweight pattern was created to handle millions of instances without crashing your memory.
Bridge Design Pattern
The Bridge Design Pattern is a structural pattern that decouples an abstraction from its implementation so that both can vary independently. It is commonly used when a class grows in two orthogonal dimensions and inheritance alone cannot prevent the explosion of subclasses.
Behavioral Design Pattern
Behavioral Design Patterns in Java are a core part of design patterns in Java that focus on communication and interaction between objects and classes. These patterns help define clear responsibilities, improve flexibility in behavior, and reduce tight coupling in complex systems.
Chain of Responsibility Design Pattern
The Chain of Responsibility design pattern enables multiple objects to handle a request sequentially, reducing tight coupling and improving flexibility by allowing requests to pass through a configurable chain of handlers.
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