LiangJava/ComputeLoanUsingInputDialog.java at master · rdejong/LiangJava

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import javax.swing.JOptionPane;

public class ComputeLoanUsingInputDialog {

public static void main(String[] args) {

// Enter yearly interest rate

String annualInterestRateString = JOptionPane.showInputDialog(

"Enter annual interest rate, e.g., 8.25:");

// Convert string to double

double annualInterestRate =

Double.parseDouble(annualInterestRateString);

// Obtain monthly interest rate

double monthlyInterestRate = annualInterestRate / 1200;

// Enter number of years

String numberOfYearsString = JOptionPane.showInputDialog(

"Enter number of years as an integer, \ne.g., 5:");

// Convert string to int

int numberOfYears = Integer.parseInt(numberOfYearsString);

// Enter loan amount

String loanString = JOptionPane.showInputDialog(

"Enter loan amount, e.g., 120000.95:");

// Convert string to double

double loanAmount = Double.parseDouble(loanString);

// Calculate payment

double monthlyPayment = loanAmount * monthlyInterestRate / (1

- 1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12));

double totalPayment = monthlyPayment * numberOfYears * 12;

// Format to keep two digits after the decimal point

monthlyPayment = (int)(monthlyPayment * 100) / 100.0;

totalPayment = (int)(totalPayment * 100) / 100.0;

// Display results

String output = "The monthly payment is $" + monthlyPayment +

"\nThe total payment is $" + totalPayment;

JOptionPane.showMessageDialog(null, output);

}