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Need Some Help
hey guys im having some trouble. the program is a credit plan for purchases. It is suppose to take in the purchase price of a computer and then output in a textArea a table including the month, current balance of that month, interest charged, principal, the monthly payment due, and the user's new balance of that month. there is a 10 percent down payment and an annual interest rate of 12 percent( i was thinking once month=12 i could somehow make the interest rate 12 percent havent figured this out yet though). It is suppose to keep on doing this until the balance of the month is 0. I have a do while loop for this and figured out some algorithms for this program
when the purchase price is entered all the ouput is correct now except i have two problems.
one like i said above is trying to figure out how to charge an interest of 12 percent anually the other is when the program runs through it doesnt finish when newBalance is zero it ends in the negatives
Code:
import javax.swing.*;
import BreezySwing.*;
public class GUICreditPlan extends GBFrame {
private JLabel purchasePriceLabel;
private DoubleField purchasePriceField;
private JButton calculateButton;
private JTextArea output;
private double purchasePrice;
private double downPayment;
private double currentBalance;
private int iterations = 1;
private int month;
private double interest = 0;
private double principal;
private double paymentDue;
private double newBalance;
public GUICreditPlan()
{
String header = Format.justify('l',"Month", 7) +
Format.justify('r',"Current Balance", 16) +
Format.justify('r',"Interest", 10) +
Format.justify('r',"Principal", 11) +
Format.justify('r',"Payment Due", 14) +
Format.justify('r',"New Balance", 14) + "\n";
purchasePriceLabel = addLabel ("Purchase Price", 1,1,1,1);
purchasePriceField = addDoubleField(0.0, 1,2,1,1);
calculateButton = addButton ("Calculate", 2,1,2,1);
output = addTextArea (header , 3,1,5,6);
output.setEnabled(false);
}
public void buttonClicked(JButton buttonObj)
{
purchasePrice = purchasePriceField.getNumber();
downPayment = (purchasePrice * .1);
currentBalance = purchasePrice - downPayment;
do
{
paymentDue = ((purchasePrice - downPayment) * .05);
interest = currentBalance * .01;
principal = currentBalance - (paymentDue - interest);
newBalance = (currentBalance + interest) - paymentDue;
month = iterations;
displayNumbers (month, currentBalance, interest, principal, paymentDue, newBalance);
currentBalance = (currentBalance + interest) - paymentDue;
iterations++;
}
while(currentBalance>0);
}
private void displayNumbers(int month, double currentBalance, double interest, double principal, double paymentDue,double newBalance)
{
String numberLine = Format.justify('l',month, 7) +
Format.justify('r',currentBalance, 16,2) +
Format.justify('r',interest, 10,2) +
Format.justify('r',principal, 11,2) +
Format.justify('r',paymentDue, 14,2) +
Format.justify('r',newBalance, 14,2) + "\n";
output.append (numberLine + "\n");
}
public static void main(String[] args)
{
GUICreditPlan theGUI = new GUICreditPlan();
theGUI.setSize(600,300);
theGUI.setTitle("Credit Plan for the TidBit Computer Store");
theGUI.setVisible(true);
}
}
heres the output with a 10,000 purchase price:
Code:
Month Current Balance Interest Principal Payment Due New Balance
1 9000.00 90.00 8640.00 450.00 8640.00
2 8640.00 86.40 8276.40 450.00 8276.40
3 8276.40 82.76 7909.16 450.00 7909.16
4 7909.16 79.09 7538.26 450.00 7538.26
5 7538.26 75.38 7163.64 450.00 7163.64
6 7163.64 71.64 6785.27 450.00 6785.27
7 6785.27 67.85 6403.13 450.00 6403.13
8 6403.13 64.03 6017.16 450.00 6017.16
9 6017.16 60.17 5627.33 450.00 5627.33
10 5627.33 56.27 5233.60 450.00 5233.60
11 5233.60 52.34 4835.94 450.00 4835.94
12 4835.94 48.36 4434.30 450.00 4434.30
13 4434.30 44.34 4028.64 450.00 4028.64
14 4028.64 40.29 3618.93 450.00 3618.93
15 3618.93 36.19 3205.12 450.00 3205.12
16 3205.12 32.05 2787.17 450.00 2787.17
17 2787.17 27.87 2365.04 450.00 2365.04
18 2365.04 23.65 1938.69 450.00 1938.69
19 1938.69 19.39 1508.08 450.00 1508.08
20 1508.08 15.08 1073.16 450.00 1073.16
21 1073.16 10.73 633.89 450.00 633.89
22 633.89 6.34 190.23 450.00 190.23
23 190.23 1.90 -257.87 450.00 -257.87
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June 3rd, 2007, 11:47 AM
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