Java CategoryAxis() Constructor

public CategoryAxis()

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
 //from   ww w .  j a v  a 2  s .  c  o m
public class Main extends Application {

    @Override
    public void start(final Stage stage) {
        stage.setWidth(500);
        stage.setHeight(500);
        Scene scene = new Scene(new Group());

        VBox root = new VBox();     
        NumberAxis lineYAxis = new NumberAxis(0,100,10);
        CategoryAxis lineXAxis = new CategoryAxis();

        lineYAxis.setLabel("Sales");
        lineXAxis.setLabel("Products");
        
        root.getChildren().addAll(lineXAxis);
        scene.setRoot(root);

        stage.setScene(scene);
        stage.show();
    }
 
    public static void main(String[] args) {
        launch(args);
    }
}