Modify the JavaFX TipCalculator application program to allow the user to enter the number of persons...

Question

Question

Modify the JavaFX TipCalculator application program to allow the user to enter the number of persons...

Modify the JavaFX TipCalculator application program to allow the user to enter the number of persons in the party through a text field. Calculate and display the amount owed by each person in the party if the bill is to be split evenly among the party members.

///////////

TipCalculatorController.java:

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.NumberFormat;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;

public class TipCalculatorController
{
// formatters for currency and percentages
private static final NumberFormat currency =
NumberFormat.getCurrencyInstance();
private static final NumberFormat percent =
NumberFormat.getPercentInstance();

private BigDecimal tipPercentage = new BigDecimal(0.15); // 15% default

// GUI controls defined in FXML and used by the controller's code
@FXML
private TextField amountTextField;

@FXML
private Label tipPercentageLabel;

@FXML
private Slider tipPercentageSlider;

@FXML
private TextField tipTextField;

@FXML
private TextField totalTextField;

// calculates and displays the tip and total amounts
@FXML
private void calculateButtonPressed(ActionEvent event)
{
try
{
BigDecimal amount = new BigDecimal(amountTextField.getText());
BigDecimal tip = amount.multiply(tipPercentage);
BigDecimal total = amount.add(tip);

tipTextField.setText(currency.format(tip));
totalTextField.setText(currency.format(total));
}
catch (NumberFormatException ex)
{
amountTextField.setText("Enter amount");
amountTextField.selectAll();
amountTextField.requestFocus();
}
}

// called by FXMLLoader to initialize the controller
public void initialize()
{
// 0-4 rounds down, 5-9 rounds up
currency.setRoundingMode(RoundingMode.HALF_UP);

// listener for changes to tipPercentageSlider's value
tipPercentageSlider.valueProperty().addListener(
new ChangeListener<Number>()
{
@Override
public void changed(ObservableValue<? extends Number> ov,
Number oldValue, Number newValue)
{
tipPercentage =
BigDecimal.valueOf(newValue.intValue() / 100.0);
tipPercentageLabel.setText(percent.format(tipPercentage));
}
}
);
}
}

/////////////////////

TipCalculator.java:

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class TipCalculator extends Application
{
@Override
public void start(Stage stage) throws Exception
{
Parent root =
FXMLLoader.load(getClass().getResource("TipCalculator.fxml"));

Scene scene = new Scene(root); // attach scene graph to scene
stage.setTitle("Tip Calculator"); // displayed in window's title bar
stage.setScene(scene); // attach scene to stage
stage.show(); // display the stage
}

public static void main(String[] args)
{
// create a TipCalculator object and call its start method
launch(args);
}
}
/////////////////////////

TipCalculator.fxml:

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

engineering Computer-Science

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Answer 1

Answer #1

If you have any problem with the code feel free to comment. I haven't included the main file as it remains the same

Controller

package tipCalculator;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.NumberFormat;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;

public class TipCalculatorController {
// formatters for currency and percentages
private static final NumberFormat currency = NumberFormat.getCurrencyInstance();
private static final NumberFormat percent = NumberFormat.getPercentInstance();

private BigDecimal tipPercentage = new BigDecimal(0.15); // 15% default

// GUI controls defined in FXML and used by the controller's code
@FXML
private TextField amountTextField;

@FXML
private Label tipPercentageLabel;

@FXML
private Slider tipPercentageSlider;

@FXML
private TextField tipTextField;

   @FXML
   private TextField totalTextField;

@FXML
private TextField noOfPersonTextfield;

@FXML
private TextField perCostTextfield;

// calculates and displays the tip and total amounts
   @FXML
   private void calculateButtonPressed(ActionEvent event) {
       try {
           BigDecimal amount = new BigDecimal(amountTextField.getText());
           //taking number of persons
           BigDecimal numberOfPerson = new BigDecimal(noOfPersonTextfield.getText());
           BigDecimal tip = amount.multiply(tipPercentage);
           BigDecimal total = amount.add(tip);
           BigDecimal perPerson = total.divide(numberOfPerson);


           tipTextField.setText(currency.format(tip));
           totalTextField.setText(currency.format(total));
           perCostTextfield.setText(currency.format(perPerson));//setting the cost per person
       } catch (NumberFormatException ex) {
           amountTextField.setText("Enter amount");
           amountTextField.selectAll();
           amountTextField.requestFocus();
       }
   }

// called by FXMLLoader to initialize the controller
public void initialize() {
// 0-4 rounds down, 5-9 rounds up
currency.setRoundingMode(RoundingMode.HALF_UP);

// listener for changes to tipPercentageSlider's value
       tipPercentageSlider.valueProperty().addListener(new ChangeListener<Number>() {
           @Override
           public void changed(ObservableValue<? extends Number> ov, Number oldValue, Number newValue) {
               tipPercentage = BigDecimal.valueOf(newValue.intValue() / 100.0);
               tipPercentageLabel.setText(percent.format(tipPercentage));
           }
       });
   }
}

FXML

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>

Output

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Answer 2

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