Improving Code with Layered Architecture

Your code is a mess because you are trying to make one file do absolutely everything.

We fixed our room scheduler project by splitting it into three distinct layers using the

Single Responsibility Principle. First, we have the Schedule class.

This is strictly for data, like dates and times. It doesn't care about the user interface

at all. Next is the Manager. This is the brain that enforces the rules,

like stopping double bookings and handling file saves. Finally, the GUI.

This is just the pretty face with the buttons and tables. It doesn't calculate

anything; it just delegates to the Manager. When you separate your logic from