This is my javafx code. Is it javafx? I can\'t run this code. what is wrong? Thi

Question

This is my javafx code. Is it javafx?

I can't run this code.

what is wrong?

This is my output.

Output Travel Expences Number of Days: 3 Amount of airfare: $ 200 Car rental fees: $ 100 Number of miles: 300 Parking tees:s 15 Lodging tees per night:s 20 Meals per day: $37.0 Parking fee per day: $10.0 Taxi charges per day $20.0 Lodging charges per day $95.0 Chargers per Message iTotal expenses ty business person: $566.0 Alowalble expenses for the trip: $567.0 Amount saved by the business person: $1.0 OK Type here to search US 10/30/2017

Explanation / Answer

import javafx.application.Application;

import javafx.collections.FXCollections;

import javafx.collections.ObservableList;

import javafx.geometry.HPos;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.*;

import javafx.scene.layout.ColumnConstraints;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.Priority;

import javafx.scene.text.Font;

import javafx.scene.text.FontWeight;

import javafx.stage.Stage;

public class TravelExpenses extends Application {

    private Label daysLabel;

    private Label airfareLabel;

    private Label carLabel;

    private Label milesLabel;

    private Label parkingLabel;

    private Label taxiLabel;

    private Label seminarLabel;

    private Label lodgeLabel;

    private Label meals;

    private Label parking;

    private Label taxi;

    private Label lodge;

    private Label mile;

    private TextField daysTextField;

    private TextField airfareTextField;

    private TextField carTextField;

    private TextField milesTextField;

    private TextField parkingTextField;

    private TextField taxiTextField;

    private TextField seminarTextField;

    private TextField lodgeTextField;

    private Button calculations;

    private final double MEALS_PER_DAY = 37.00;

    private final double PARKING_PER_DAY = 10.00;

    private final double TAXT_PER_DAY = 20.00;

    private final double LODGING_PER_DAY = 95.00;

    private final double D_PER_MILE = 0.27;

    public static void main(String[] args) {

        launch();

    }

    @Override

    public void start(Stage primaryStage) throws Exception {

        primaryStage.setTitle("Travel Expences");

        Font font = Font.font("Arial", FontWeight.BOLD, 12);

        GridPane gridPane = createRegistrationFormPane();

        createLabels(font);

        createInputFields();

        calculations = new Button("Display the details");

        calculations.setOnAction(e -> calculate());

        calculations.setFont(font);

        addElements(gridPane);

        Scene scene = new Scene(gridPane, 280, 500);

        primaryStage.setScene(scene);

        primaryStage.show();

    }

    private void createLabels(Font font) {

        daysLabel = new Label("Number of Days: ");

        airfareLabel = new Label("Amount of airfare: $");

        carLabel = new Label("Car rental fees: $");

        milesLabel = new Label("Number of miles: ");

        parkingLabel = new Label("Parinkg fees: $");

        taxiLabel = new Label("Taxi charges: $");

        seminarLabel = new Label("Seminar fees: $");

        lodgeLabel = new Label("Lodging fees per night: $");

        meals = new Label("Meals per day: $" + MEALS_PER_DAY);

        parking = new Label("Parking fee per day: $" + PARKING_PER_DAY);

        taxi = new Label("Taxi charges per day: $" + TAXT_PER_DAY);

        lodge = new Label("Lodging charges per day: $" + LODGING_PER_DAY);

        mile = new Label("Chargers per mile: $" + D_PER_MILE);

    }

    private void createInputFields() {

        daysTextField = new TextField();

        carTextField = new TextField();

        milesTextField = new TextField();

        parkingTextField = new TextField();

        taxiTextField = new TextField();

        seminarTextField = new TextField();

        lodgeTextField = new TextField();

    }

    private void addElements(GridPane gridPane) {

        gridPane.add(daysLabel, 0,0,2,1);

        gridPane.add(daysTextField, 0, 1, 2, 1);

        gridPane.add(airfareLabel, 0,2,2,1);

        gridPane.add(airfareTextField, 0, 3, 2, 1);

        gridPane.add(carLabel, 0, 4, 2, 1);

        gridPane.add(carTextField, 0, 5, 2, 1);

        gridPane.add(milesLabel, 0, 8, 2, 1);

        gridPane.add(milesTextField, 0, 9, 2, 1);

        gridPane.add(parkingLabel, 0, 10, 2, 1);

        gridPane.add(parkingTextField, 0, 11, 2, 1);

        gridPane.add(taxiLabel, 0, 12, 2, 1);

        gridPane.add(taxiTextField, 0, 13, 2, 1);

        gridPane.add(seminarLabel, 0, 14, 2, 1);

        gridPane.add(seminarTextField, 0, 15, 2, 1);

        gridPane.add(lodgeLabel, 0, 16, 2, 1);

        gridPane.add(lodgeTextField, 0, 17, 2, 1);

        gridPane.add(calculations, 1, 24, 1, 1);

        gridPane.add(meals,1,25,1,1);

        gridPane.add(parking,1,25,1,1);

        gridPane.add(taxi,1,25,1,1);

        gridPane.add(lodge,1,25,1,1);

        gridPane.add(mile,1,25,1,1);

        gridPane.add(calculations,1,25,1,1);

        calculations.setPrefWidth(200);

        calculations.setMinWidth(200);

        calculations.setAlignment(Pos.CENTER);

    }

    private GridPane createRegistrationFormPane() {

        GridPane gridPane = new GridPane();

        gridPane.setAlignment(Pos.CENTER);

        gridPane.setPadding(new Insets(20));

        gridPane.setHgap(20);

        gridPane.setVgap(5);

        ColumnConstraints columnOneConstraints = new ColumnConstraints(140, 140, Double.MAX_VALUE);

        columnOneConstraints.setHalignment(HPos.CENTER);

        ColumnConstraints columnTwoConstrains = new ColumnConstraints(60,60, Double.MAX_VALUE);

        columnTwoConstrains.setHgrow(Priority.ALWAYS);

        columnTwoConstrains.setHalignment(HPos.RIGHT);

        gridPane.getColumnConstraints().addAll(columnOneConstraints, columnTwoConstrains);

        return gridPane;

    }

    private void calculate() {

        double totalExpences;

        double allowedExpences;

        double days = Integer.parseInt(daysTextField.getText());

        double d1 = Double.parseDouble(airfareTextField.getText());

        double d2 = Double.parseDouble(carTextField.getText());

        double d3 = Double.parseDouble(milesTextField.getText());

        double d4 = Double.parseDouble(parkingTextField.getText());

        double d5 = Double.parseDouble(taxiTextField.getText());

        double d6 = Double.parseDouble(seminarTextField.getText());

        double d7 = Double.parseDouble(lodgeTextField.getText());

        totalExpences = d1 + d2 + (d3 * D_PER_MILE) + d4 + d5

                + d6 + (d7 * days);

        allowedExpences = (MEALS_PER_DAY + PARKING_PER_DAY + TAXT_PER_DAY +

                LODGING_PER_DAY) * days + (d3 * D_PER_MILE);

        alert(String.format("Total expenses by business person: $%s " +

                "Allowable expenses for the trip: $%s Amount saved by the business person: $%s"));

    }

    private void alert(String text) {

        Alert alert = new Alert(Alert.AlertType.INFORMATION);

        alert.setTitle("Message");

        alert.setHeaderText(null);

        alert.setContentText(text);

        alert.getDialogPane().setPrefWidth(300);

        alert.showAndWait();

    }

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