Write a JavaFX program name InvestmentCalc that calculates the future value of a

Question

Write a JavaFX program name InvestmentCalc that calculates the future value of an investment at a given interest rate for a specified number of years. The formula for the calculation is:

futureValue = investmentAmount * (1 + monthlyInterestRate) years*12

Use text fields for the investment amount, number of years, and annual interest rate. Display the future amount in a text field when the user clicks the Calculate button. Your display should look similar to the one below:

Investment calculator Investment Amount Number of Years Annual Interest Rate: Future value: 10000 3.25 $11386.28 Calculate

Explanation / Answer

Hi Please find the complete program below. In case of any issue, please let us know. Thanks

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class InvestmentCalc extends Application { //Extending Application class

@Override
public void start(Stage calculatorPrimaryStage) throws Exception {

InvestmentCalculatorPane calculatorPane = new InvestmentCalculatorPane();

/*
* Creating screen for the InvestmentCalc applcication
*/
calculatorPrimaryStage.setScene(new Scene(calculatorPane, calculatorPane.getPrefWidth(), calculatorPane.getPrefHeight()));
calculatorPrimaryStage.setTitle("Investment calculator"); //Setting Application name that is displayed in Title bar
calculatorPrimaryStage.show();
}

public static void main(String[] args) {

Application.launch(args); //Launches the FX applicaiton
}

/*
* Creating a class InvestmentCalculatorPane which extends GridPane for creating labels and textfields
*/
private class InvestmentCalculatorPane extends GridPane {
/*
* Creating test fields and labels for InvestmentCalc :: Start
*/
Label InvestmentAmountLabel = new Label("Investment Amount:");
TextField InvestmentAmountTF = new TextField();

Label NumberOfYearsLabel = new Label("Number Of Years:");
TextField NumberOfYearsTF = new TextField();

Label AnnualInterestRateLabel = new Label("Annual Interest Rate:");
TextField AnnualInterestRateTF = new TextField();

Label FutureValueLabel = new Label("Future Value:");
TextField FutureValueTF = new TextField();

Button CalculateButton = new Button("Calculate");
/*
* Creating test fields and labels for InvestmentCalc :: End
*/
  
  
private InvestmentCalculatorPane() {

// Create layout and Positioning test fields and labels in the screen
setPadding(new Insets(15, 15, 15, 15));
setAlignment(Pos.CENTER);
setHgap(12);
setVgap(12);

add(InvestmentAmountLabel, 0, 0);
add(InvestmentAmountTF, 1, 0);

add(NumberOfYearsLabel, 0, 1);
add(NumberOfYearsTF, 1, 1);

add(AnnualInterestRateLabel, 0, 2);
add(AnnualInterestRateTF, 1, 2);

add(FutureValueLabel, 0, 3);
add(FutureValueTF, 1, 3);

HBox buttons = new HBox();
buttons.getChildren().add(CalculateButton);
buttons.setAlignment(Pos.BOTTOM_RIGHT);
add(buttons, 1, 4);
CalculateButton.setOnAction(e-> calcFutureValue());

// Editing TextField settings
TextField[] textFields = (TextField[])getArray(
       InvestmentAmountTF, NumberOfYearsTF, AnnualInterestRateTF, FutureValueTF);

//Setting alignment for test fields
for (TextField tf : textFields) {
tf.setAlignment(Pos.BASELINE_RIGHT);
}
// FutureValue test field is enabled. To disable make it ture
FutureValueTF.setDisable(false);

}

private Object[] getArray(Object... objects) {
Object[] temp = new TextField[objects.length];
for (int i = 0; i < objects.length; i++) {
temp[i] = objects[i];
}
return temp;
}

public void calcFutureValue() {
   //Reading values from text fields
double investmentAmount = Double.parseDouble(InvestmentAmountTF.getText());
double years = Double.parseDouble(NumberOfYearsTF.getText());
double monthlyInterestRate = Double.parseDouble(AnnualInterestRateTF.getText()) / 12 / 100;

//calculating future investment
double futureValue = investmentAmount * Math.pow(1 + monthlyInterestRate, years * 12);
//displaying future value in FutureValue Text field
FutureValueTF.setText(String.format("$%.2f", futureValue));
}
}
}

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