I am trying to model credit card data in JavaFx using a GridPane:

My mode contains 3 rows (Note: each field is comprised of label text field):

Row 1: First name and last name (4 fields)

Row 2: Credit card number (2 fields)

Row 3: Expiration date - month, year CVV (6 fields)

See screenshot below:

I was reading

Now you will know which node will sit in which column and how many columns it will occupy (colspan)

I will explain for one node:

Lets say you want insert the field of first name. If you notice in the picture, it is in rowIndex: 0, columnIndex: 1 and it is occupying 4 columns, so the colSpan value will be 4. Here we are not combining any rows, so the rowSpan value will be always 1.

pane.add(getField(), 1, 0, 4, 1); // node, colIndex, rowIndex, colSpan, rowSpan

Similarly you can relate the rest of the nodes layouting. And also for more precising you can set the prefered width of each column using ColumnConstraints. Below is the complete code for the layout & constraints:

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Region;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class CreditCardPaneDemo extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        VBox root = new VBox();
        root.setPadding(new Insets(5));
        root.setSpacing(10);
        Scene scene = new Scene(root,300,200);
        stage.setScene(scene);
        stage.setTitle("CreditCard");
        stage.show();

        GridPane pane = new GridPane();
        pane.setStyle("-fx-border-color:black;-fx-border-width:1px;-fx-background-color:yellow");
        pane.setPadding(new Insets(5));
        pane.setHgap(5);
        pane.setVgap(5);

        pane.add(getLabel("First"), 0, 0, 1, 1);
        pane.add(getField(), 1, 0, 4, 1);
        pane.add(getLabel("Last"), 5, 0, 1, 1);
        pane.add(getField(), 6, 0, 2, 1);

        pane.add(getLabel("Card Number"), 0, 1, 3, 1);
        pane.add(getField(), 3, 1, 5, 1);

        pane.add(getLabel("Month"), 0, 2, 2, 1);
        pane.add(getField(), 2, 2, 2, 1);
        pane.add(getLabel("Year"), 4, 2, 1, 1);
        pane.add(getField(), 5, 2, 1, 1);
        pane.add(getLabel("CVV"), 6, 2, 1, 1);
        pane.add(getField(), 7, 2, 1, 1);

        pane.getColumnConstraints().addAll(getCc(70), getCc(20), getCc(80), getCc(20), getCc(25), getCc(90), getCc(80), getCc(100));

        CheckBox gridLines = new CheckBox("Show grid lines");
        gridLines.selectedProperty().addListener((obs, old, val) -> pane.gridLinesVisibleProperty().set(val));
        root.getChildren().addAll(gridLines, pane);
    }

    private ColumnConstraints getCc(double width) {
        ColumnConstraints cc = new ColumnConstraints();
        cc.setPrefWidth(width);
        return cc;
    }

    private Label getLabel(String txt) {
        Label lbl = new Label(txt);
        lbl.setMinWidth(Region.USE_PREF_SIZE);
        return lbl;
    }

    private TextField getField() {
        TextField field = new TextField();
        field.setMaxWidth(Double.MAX_VALUE);
        return field;
    }
}