Question

I need help with this code:

Write a program 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 as follows:
futureValue = investmentAmount * (1 + monthlyInterestRate)years*12
Use text fields for interest rate, investment amount, and years. Display the future amount in a text field when the user clicks the Calculate button, as shown in the following figure. It needs to be done in java fx.

Thank you in advance!!

Answer 1

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
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.stage.Stage;

public class FutureValue extends Application {

        TextField investment, rate, years, futureValue;

        @Override
        public void start(Stage myStage) {

                myStage.setTitle("Future Value");

                GridPane rootNode = new GridPane();
                rootNode.setPadding(new Insets(25));
                rootNode.setHgap(10);
                rootNode.setVgap(10);
                rootNode.setAlignment(Pos.CENTER);

                Scene myScene = new Scene(rootNode, 500, 500);
                
                rootNode.add(new Label("Investment Amount"), 0, 0);
                investment = new TextField();
                rootNode.add(investment, 1, 0);
                
                rootNode.add(new Label("Annual Interest Rate"), 0, 1);
                rate = new TextField();
                rootNode.add(rate, 1, 1);
                
                rootNode.add(new Label("Number of years"), 0, 3);
                years = new TextField();
                rootNode.add(years, 1, 3);

                futureValue = new TextField();
                futureValue.setEditable(false);
                
                rootNode.add(new Label("Future Value:"), 0, 4);
                rootNode.add(futureValue, 1, 4);                
                
                Button computeButton = new Button("Calculate");
                rootNode.add(computeButton, 0, 5, 2, 1);
                GridPane.setHalignment(computeButton, HPos.CENTER);

                computeButton.setOnAction(new EventHandler<ActionEvent>() {
                        @Override
                        public void handle(ActionEvent event) {
                                calculateAndSetValues();
                        }
                });

                myStage.setScene(myScene);
                myStage.show();
        }

        private void calculateAndSetValues() {
                                
                double amount = Double.parseDouble(investment.getText());
                double interestRate = Double.parseDouble(rate.getText());
                double numyears = Integer.parseInt(years.getText());

                double finalAmount = amount * (1 + interestRate/12.0) * numyears * 12;
                
                futureValue.setText("$" + finalAmount);
        }

        public static void main(String[] args) {
                launch(args);
        }
}

please upvote for the efforts i have put for this.