This work deals with the development and use of a graphical editor of object-oriented Petri nets implemented in the PNtalk language. First, Petri nets that expand over time are described here. They are followed by a description of the object-oriented paradigm. Next, the structure of object-oriented Petri nets in the implementation of PNtalk is described here. Further work presents a description of the application design, which shows the entire structure of the application from the perspective of views. The main motivation for creating this tool is the effort to make object-oriented Petri nets accessible to their users. The application was implemented in the JavaFX framework and the whole procedure is given in the following chapter together ...