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Thread: Help needed writing a program using JOptionPane

  1. #1
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    Default Help needed writing a program using JOptionPane

    Write a Java program that lets the user enter the loan amount and loan period in number of years and
    displays the monthly and total payments for each annual interest rate starting from 3.5% to 8% with an
    increment of 0.25%. Below are the formulas that can be used to calculate monthlyPayment & totalPayment.

    factor = 1/ 1+(annualInterestRate/1200)

    monthlyPayment = loanAmount * (1 - factor) / (factor * (1 - Math.pow(factor, numOfYears * 12)))


    totalPayment = monthlyPayment * 12 * numOfYears;


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: Help needed writing a program using JOptionPane

    And...what's the problem? What have you tried? Where are you stuck? Suggest you read the link in my signature for getting help

  3. #3
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    Default Re: Help needed writing a program using JOptionPane

    Quote Originally Posted by copeg View Post
    And...what's the problem? What have you tried? Where are you stuck? Suggest you read the link in my signature for getting help
    This is what I have so far and I obviously know it's not correct at all. This is my very first time writing something like this JOptionPane.

    import javax.swing.JOptionPane;

    public class Payment {

    public static void main (String [] args) {

    String numOfYears;
    double annualInterestRate;
    double loanAmount;
    //String monthlyPayment;
    //String totalPayment;


    String loanAmountString = JOptionPane.showInputDialog (null,
    "Please enter the loan amount:",
    "Lab Assignment 1",
    JOptionPane.QUESTION_MESSAGE);
    double monthlyPayment = Double.parseDouble(loanAmountString);
    double totalPayment = Double.parseDouble(loanAmountString);

    numOfYears = JOptionPane.showInputDialog (null,
    "Please enter the number of years:",
    "Lab Assignment 1",
    JOptionPane.QUESTION_MESSAGE);


    //totalPayment = Double.parseDouble (monthlyPayment * 12 * numOfYears);


    }

    }

  4. #4
    Super Moderator copeg's Avatar
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    Default Re: Help needed writing a program using JOptionPane

    I'll reiterate, if you want quality help I recommend reading the getting help link in my signature. It describes the questions you should ask as well as how to use the code tags so your code is readable.

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