Sometimes, we are extremely lucky and have the possibility to follow best practices as we kick off a project. If we start writing object-oriented code from scratch, we can take advantage of all the features that we have been using in our examples throughout the book. As the requirements evolve, we may need to further generalize or specialize all the blueprints. However, as we started our project with an object-oriented approach and organizing our code, it is easier to make adjustments to the code.

Most of the times, we aren't extremely lucky and have to work on projects that don't follow best practices. In the name of Agile, we generate pieces of code that perform similar tasks without a decent organization. Instead of following the same bad practices that generated error-prone, repetitive, and difficult to maintain code, we can use all the features provided by all the different IDEs and additional helper tools to refactor existing code and generate object...