andrezatcascais / dio-lab-patterns-project-java

Exploring Design Patterns in Practice with Java. This course is a module of the Bootcamp organised by DIO - Digital Innovation.

Design Patterns

This repository contains examples and explanations for three common design patterns: Singleton, Strategy, and Facade.

Singleton

The Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Intent: To control object creation, limiting the number of objects to one.
• Use Case: When only one instance of a class is needed to coordinate actions across a system.

Structure

Example about the Singleton Pattern

Strategy

The Strategy pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable.

• Intent: To define a family of algorithms, encapsulate each one, and make them interchangeable.
• Use Case: When you want to define a class that will have one behavior that is similar to other behaviors in a list.

Structure

Example about the Strategy Pattern

Facade

The Facade pattern provides a simplified interface to a complex subsystem.

• Intent: To provide a unified interface to a set of interfaces in a subsystem.
• Use Case: When you want to provide a simple interface to a complex subsystem.

Structure

Example about the Facade Pattern