Simple example of MVVM design pattern in Java without designing any UI (Swing, JavaFX etc)

I want to understand MVVM design pattern in Java but I don't want to design a GUI (view) using Swing or JavaFX. I am unable to find any such example in Java on internet. Most of the examples of MVVM are in Android. Can you provide a simple example for the same so that I don't require to learn Swing or JavaFX to understand it?