Part 1:

Please help me modify my code in java to make the calculator look like this. I can't seem to be able to add the "Input:" and "Output:"

My code so far:

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import javafx.application.Application;

import javafx.geometry.Pos;

import javafx.geometry.HPos;

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 LoanCalculator extends Application {

private TextField tfAnnualInterestRate = new TextField();

private TextField tfNumberOfYears = new TextField();

private TextField tfLoanAmount = new TextField();

private TextField tfMonthlyPayment = new TextField();

private TextField tfTotalPayment = new TextField();

private Button btCalculate = new Button("Calculate");

@Override // Override the start method in the Application class

public void start(Stage primaryStage) {

// Create UI

GridPane gridPane = new GridPane();

gridPane.setHgap(5);

gridPane.setVgap(5);

gridPane.add(new Label("Annual Interest Rate:"), 0, 0);

gridPane.add(tfAnnualInterestRate, 1, 0);

gridPane.add(new Label("Number of Years:"), 0, 1);

gridPane.add(tfNumberOfYears, 1, 1);

gridPane.add(new Label("Loan Amount:"), 0, 2);

gridPane.add(tfLoanAmount, 1, 2);

gridPane.add(new Label("Monthly Payment:"), 0, 3);

gridPane.add(tfMonthlyPayment, 1, 3);

gridPane.add(new Label("Total Payment:"), 0, 4);

gridPane.add(tfTotalPayment, 1, 4);

gridPane.add(btCalculate, 1, 5);

// Set properties for UI

gridPane.setAlignment(Pos.CENTER);

tfAnnualInterestRate.setAlignment(Pos.BOTTOM_RIGHT);

tfNumberOfYears.setAlignment(Pos.BOTTOM_RIGHT);

tfLoanAmount.setAlignment(Pos.BOTTOM_RIGHT);

tfMonthlyPayment.setAlignment(Pos.BOTTOM_RIGHT);

tfTotalPayment.setAlignment(Pos.BOTTOM_RIGHT);

tfMonthlyPayment.setEditable(false);

tfTotalPayment.setEditable(false);

GridPane.setHalignment(btCalculate, HPos.RIGHT);

// Process events, set up handler

btCalculate.setOnAction(e -> calculateLoanPayment());

// Create a scene and place it in the stage

Scene scene = new Scene(gridPane, 400, 250);

primaryStage.setTitle("LoanCalculator"); // Set title

primaryStage.setScene(scene); // Place the scene in the stage

primaryStage.show(); // Display the stage

}

private void calculateLoanPayment() {

// Get values from text fields

double interest =

Double.parseDouble(tfAnnualInterestRate.getText());

int year = Integer.parseInt(tfNumberOfYears.getText());

double loanAmount =

Double.parseDouble(tfLoanAmount.getText());

// Create a loan object. Loan defined in Listing 10.2

Loan loan = new Loan(interest, year, loanAmount);

// Display monthly payment and total payment

tfMonthlyPayment.setText(String.format("$%.2f",

loan.getMonthlyPayment()));

tfTotalPayment.setText(String.format("$%.2f",

loan.getTotalPayment()));

}

/**

* The main method is only needed for the IDE with limited

* JavaFX support. Not needed for running from the command line.

*/

public static void main(String[] args) {

launch(args);

}

}

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Part 2: Simple Calculator

Write a java program that performs addition, subtraction, multiplication and division. I need four buttons, three labels, and three text fields. The layout of the calculator can be designed as you see fit.

LoanCalculator Input: Annual Interest Rate: Number of Years Loan Amount: Calculate Output Monthly Payment Total Payment