Java Design Patterns Tutorial

Java Design Patterns are well-established design techniques that help developers create efficient, flexible, and maintainable software applications. They offer structured approaches to solving common design challenges and promote the use of industry best practices.

• Improve code reusability and maintainability
• Provide standard solutions for recurring design problems
• Enhance communication among developers using common design terminology

Prerequisites for Learning Design Patterns

Before learning design patterns, it is important to understand the object-oriented concepts on which they are built.

• Class and Object
• Encapsulation
• Inheritance
• Polymorphism
• Abstraction

Object Relationships

Understanding object relationships is extremely important because many design patterns are based on these relationships.

• Association, Aggregation and Composition

Types of Design Patterns in Java

Design patterns are categorized into three major groups:

Creational Design Patterns in Java

Creational design patterns focus on efficient and flexible object creation. They decouple the system from the process of instantiating objects, making the code more maintainable, adaptable and independent of how objects are constructed or represented.

Types of Creational Design Patterns in Java

• Factory Method
• Abstract Factory Method
• Singleton Method
• Prototype Method
• Builder Method

Structural Design Patterns in Java

Structural design patterns define how classes and objects are combined to form larger, flexible structures. They simplify object relationships, improve reusability and make systems easier to understand and maintain.

Types of Structural Design Patterns in Java

• Adapter Method
• Bridge Method
• Composite Method
• Decorator Method
• Facade Method
• Flyweight Method
• Proxy Method

Behavioral Design Patterns in Java

Behavioral design patterns are a group of design patterns that focus on how objects and classes interact and communicate in software development. They emphasize the collaboration between objects to effectively accomplish tasks and responsibilities, making the system more manageable and adaptable

Types of Behavioral Design Pattern in Java

• Chain Of Responsibility Method
• Command Method
• Interpreter Method
• Mediator Method
• Memento Method
• Observer Method
• State Method
• Strategy Method
• Template Method
• Visitor Method