Simple implementation of MVC Program

Implement the MVC Architecture in JavaProgramIt is easy, and provides APIs.
When building a model class, we only need to let it inherit the import Java. util. the observable class can be written as follows in the constructor: This. addobserver (View); this view is your view class, which associates the model with the view. after updating the data in the model, we must notify the view to make changes. Therefore, add the following sentence: This. yyobservers (); this notifies all views associated with the model.

In the View class, we need to implement Java. util. observer interface, and implement the update () {} method. Once the model notifies the view that the data has changed, the view automatically calls the update () method to update the data.