Advanced Object Oriented Programming-Advanced Java OOP Guide

Example

A graphics application uses shapes. A 'Shape' base class provides basic attributes like position, and derived classes such as 'Circle' and 'Rectangle' add specific attributes and override methods for drawing. Polymorphism allows treating all shapes uniformly, simplifying code for rendering and manipulation.

Scenario

When developing a drawing application that requires a unified way to handle different types of graphical objects.

Example

The Singleton pattern ensures a class has only one instance and provides a global point of access to it, useful for managing database connections in an application.

Scenario

In a web application managing user sessions, ensuring a single database connection instance reduces overhead and manages resources efficiently.

Example

The Dependency Inversion Principle is applied in a modular application framework, where high-level modules do not depend on low-level modules but on abstractions. This is achieved through interface-based design, allowing for flexible module integration and easier testing.

Scenario

Building a large-scale enterprise application where different modules need to interact without being tightly coupled, facilitating easier maintenance and scalability.