Problema. -
La clase Baguel se va armando por masa, spread y topping mediante un conjunto complejo de condiciones esparcidas por la clase. Hay varios casos de código innecesario respecto a la creación del objeto.


Solución. -
Usando el patrón de diseño creacional de Builder, podemos construir el objeto paso a paso, reusar algún constructor previo y separar responsabilidades. De la misma manera, se podría agregar productor que compartan el mismo comportamiento. Por ejemplo, en un futuro agregar crepes al menú.
UML. -

Problema. -
Se trabaja con productos que se les puede añadir ciertas características extras que pueden ser tanto todas añadidas a la vez como no o incluso mezcladas entre sí.

Solución. -
Por esta razón se recomendaría usar el patrón de diseño estructural de Decorator, este facilitaría la escalabilidad del código e incluso su uso, no creeríamos herencia innecesaria. Podemos combinar varios comportamientos de un objeto con varios decorators y separar responsabilidades.
UML. -

The way you handle different types of shop's products (coffee, bagels, pastries) is ok, but if you want to add more products of even more flavors, or add variety to the same products it will be hard to update and maintain, in other words, your code could be cleaner and allow scalability pretty well if you consider implementing a design pattern, which in this case I considerer should be decorator

The Coffee, Bagel and Pastry classes are initialized the same way, they have the same attributes, getters and setters. By refactoring with the Extract SuperClass technique and creating a parent class you get rid of duplicate code, making the code in child classes less bulky, more readable, and understandable.

The constructor of the BagelApp class is very long and implements functionalities that it should not, when refactoring using Extract Method the constructor only takes care of instantiating the business classes, and apart from that a buildApp () method is created which in turn contains setAppProperties () and setPanelsToLayout ().

The Coffee, Bagel and Pastry classes have the getSelectedButton method with different implementations that involve graphical interface objects, to maintain a more orderly and clean code, the business classes must be kept separate from the views. In addition, in the BagelApp class in the actionPerformed method there is a method that is too long because it contains the logic of all the Bagel, Coffee and Pastry sub-panels. It is necessary to refactor and create new classes for the graphical interface of the subpanels, where the getSelectedButton methods of the Business classes and other methods associated with the GUI of the Order class that involve these classes are moved, in this way it is possible to have greater readability and code maintenance.