Hello, this is my first post here and I noticed that other people have been struggling with this assignment too. It is the mortgage calculator program for UOP PRG420. So I am sure you all are probably about sick of this by now, but I need help. The book is helpful but does not show how to get the calculations to display. Actually, after I correct this code I will need to go back and change it again because the assignment wants it in the command window and I have it written so far using javax.swing.JOptionPane. The reason is because that is how the text shows me. I can follow along with the text with ease but when it comes to doing things differently than the text I struggle a bit. So here is my code so far.....
import javax.swing.JOptionPane;
import java.text.DecimalFormat;
import java.io.*;
public class NewMortgage
{
public static void main(String[] args)
{
//class variables
double interest, payment, amount;
int term;
amount=getLoan();
interest=getRate();
term=getTerm();
output(amount, interest, term, payment);
payment=(amount*((interest/12)/(1-Math.pow((1+(interest/12)),-(term*12)))));
}
//getLoan method to ge the amount of the loan
public static double getLoan()
{
double amount=0.0;
boolean done = false;
while (!done)
{
String answer = JOptionPane.showInputDialog(null,
"Enter the amount of the loan: $");
if (answer == null) finish();
try
{
amount = Double.parseDouble(answer);
if(amount <=0) throw new NumberFormatException();
else done = true;
}
catch(NumberFormatException e)
{
JOptionPane.showMessageDialog(null, "Your amount was not entered in the correct format.",
"Error",JOptionPane.INFORMATION_MESSAGE);
}
}
return amount;
}
public static double getRate()
{
double interest=0.0;
boolean done = false;
while (!done)
{
String answer = JOptionPane.showInputDialog(null,
"Enter the interest rate of the loan: ");
if (answer == null) finish();
try
{
interest = Double.parseDouble(answer);
if(interest <=0) throw new NumberFormatException();
else done = true;
}
catch(NumberFormatException e)
{
JOptionPane.showMessageDialog(null, "Your interest amount was not entered in the correct format.",
"Error",JOptionPane.INFORMATION_MESSAGE);
}
}
return interest;
}
public static int getTerm()
{
int term=0;
boolean done = false;
while (!done)
{
String answer = JOptionPane.showInputDialog(null,
"Enter the term of the loan in years:");
if (answer == null) finish();
try
{
term = Integer.parseInt(answer);
if(term <=0) throw new NumberFormatException();
else done = true;
}
catch(NumberFormatException e)
{
JOptionPane.showMessageDialog(null, "Please tell me the correct length of the loan. IE enter 30 for a 30 year mortgage",
"Error",JOptionPane.INFORMATION_MESSAGE);
}
}
return term;
}
public static void output(double amount, double interest, double payment, int term)
{
payment=(amount*((interest/12)/(1-Math.pow((1+(interest/12)),-(term*12)))));
DecimalFormat twoDigits = new DecimalFormat ("$#,000.00");
JOptionPane.showMessageDialog(null, "The Monthly Payment for a" + twoDigits.format(amount) + "loan with an interest rate of" + twoDigits.format(interest) + "for"+ twoDigits.format(term) + "is" + payment, JOptionPane.INFORMATION_MESSAGE);
}
//finish method to end program
public static void finish()
{
System.exit(0);
}
}Everything was working fine with the code until I tried to enter in the output method and get a calculation displayed. So I have tried for about 4 hours now and still get error after error. The first error is:
output(double,double,double,int) in NewMortgage cannot be applied to (double,double,int,double)
output(amount, interest, term, payment);
I tried to change up the variables inside the output() declaration but that just made more errors. The second is:
cannot find symbol
symbol : method showMessageDialog(<nulltype>,java.lang.String,int)
location: class javax.swing.JOptionPane
JOptionPane.showMessageDialog(null, "The Monthly Payment for a" + twoDigits.format(amount) + "loan with an interest rate of" + twoDigits.format(interest) + "for"+ twoDigits.format(term) + "is" + payment, JOptionPane.INFORMATION_MESSAGE);
I can't understand this error either because the showMessageDialog worked just fine in all the other methods.
Any help would be appreiciated here. And I will probably be back because there is more to the assignment that I haven't gotten to yet. I can't question what I haven't tried though so that will wait, I just want this program to work, I have spent way too much time on this. Please.
