package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import sample.model.Person;
import sample.view.PersonOverviewController;
import sample.view.RootLayoutController;

import java.io.IOException;

public class Main extends Application {
    private Stage primaryStage;
    private BorderPane rootLayout;

    private Person person = new Person();


    @Override
    public void start(Stage primaryStage) throws Exception{
        this.primaryStage = primaryStage;
        this.primaryStage.setTitle("JavaFX App");

        initRootLayout();


    }

    public void initRootLayout() {
        try {
            // Загружаем корневой макет из fxml файла.
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(Main.class.getResource("/view/RootLayout.fxml"));
            rootLayout = (BorderPane) loader.load();

            // Отображаем сцену, содержащую корневой макет.
            Scene scene = new Scene(rootLayout);
            primaryStage.setScene(scene);
            primaryStage.show();

            // Даём контроллеру доступ к главному приложению.
            RootLayoutController controller2 = loader.getController();
            controller2.setMainApp(this);


        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static void main(String[] args) {
        launch(args);
    }

    public void AddData(){
      person.setFirstName("Иван");
      person.setLastName("Иванов");
      person.setMiddleName("Иванович");
    }
}

package sample.view;

import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.AnchorPane;
import sample.Main;

import java.io.IOException;

public class RootLayoutController {
    @FXML
    private ScrollPane scrpMain;

    private Main main;

    public void setMainApp(Main main) {
        this.main = main;
    }

    @FXML
    private void initialize(){
    }

    public void showPersonOverview() {
        try {
            // Загружаем
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(Main.class.getResource("/view/PersonOverview.fxml"));
            AnchorPane personOverview = (AnchorPane) loader.load();

            // Даём контроллеру доступ к главному приложению.
            PersonOverviewController controller = loader.getController();
            controller.setMainApp(main);

            // Помещаем
            scrpMain.setContent(personOverview);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

package sample.view;

import sample.Main;

public class PersonOverviewController {

    private Main main ;

    public void setMainApp(Main main) {
        this.main = main;
    }

    public void btnAddDataClick(){
      //main.AddData();
    }
}

package sample.model;

import javafx.beans.property.StringProperty;

public class Person {
    private final StringProperty firstName;
    private final StringProperty lastName;
    private final StringProperty middleName;

    public Person() {
        this(null, null, null);
    }

    public Person(StringProperty firstName, StringProperty lastName, StringProperty middleName) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.middleName = middleName;
    }

    public String getFirstName() {
        return firstName.get();
    }

    public StringProperty firstNameProperty() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName.set(firstName);
    }

    public String getLastName() {
        return lastName.get();
    }

    public StringProperty lastNameProperty() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName.set(lastName);
    }

    public String getMiddleName() {
        return middleName.get();
    }

    public StringProperty middleNameProperty() {
        return middleName;
    }

    public void setMiddleName(String middleName) {
        this.middleName.set(middleName);
    }
}