Thread: Need help please

I have about 4 hours of class time with Java and have an assignment due. I cant figure out how to fix my code. I know Im having issues with my print statements but I just dont understand it. Here is what I have and what is required: Calculate and display the monthly payment amount to fully amortize a $200,000.00 loan over a 30 year term at 5.75% interest. Please help.


package mortgagecalculator;


public class MortgageCalculator {
public static void main(String[] args) {

}

double annualInterest = 5.75; //This is the annual interest rate
double loanAmount = 200000; //This is the loan amount
double loanLengthInYears = 30; //This is the length of the loan in years


//Formuals bieng used are:
double monthlyInterest = annualInterest / 100 /12;
double loanLengthInMonths = loanLengthInYears * 12;

double monthlyPayment = (loanAmount * monthlyInterest) / (1 - Math.pow((1 + monthlyInterest), loanLengthInYears));


System.out.println("MortgageCalculator");
System.out.println("Annual Interest: 5.75%");
System.out.println("Loan Amount: $200,000");
System.out.println("Loan Length: 30 years");
System.out.println("Monthly Payment: " + currencyFormat.format(monthlyPayment));

What is currencyFormat.format. Are they custom class and method? If they are you will need to post the code. I think what you are looking for is the String.format
method. Take a look at this link: Java Platform SE 7 look at the format method.

Hope it helps

Would it make a difference if that last println statement was replaced like this:


package mortgagecalculator;


/**
*
* @author Johnny
*/
public class MortgageCalculator {
public static void main(String[] args) {

}

double annualInterest = 5.75; //This is the annual interest rate
double loanAmount = 200000; //This is the loan amount
double loanLengthInYears = 30; //This is the length of the loan in years


//Formuals bieng used are:
double monthlyInterest = annualInterest / 100 /12;
double loanLengthInMonths = loanLengthInYears * 12;

double monthlyPayment = (loanAmount * monthlyInterest) / (1 - Math.pow((1 + monthlyInterest), loanLengthInYears));


System.out.println("MortgageCalculator");
System.out.println("Annual Interest: 5.75%");
System.out.println("Loan Amount: $200,000");
System.out.println("Loan Length: 30 years");
System.out.println(monthlyPayment);

Originally Posted by kprofgold

Would it make a difference if that last println statement was replaced like this:


package mortgagecalculator;


/**
*
* @author Johnny
*/
public class MortgageCalculator {
public static void main(String[] args) {

}

double annualInterest = 5.75; //This is the annual interest rate
double loanAmount = 200000; //This is the loan amount
double loanLengthInYears = 30; //This is the length of the loan in years


//Formuals bieng used are:
double monthlyInterest = annualInterest / 100 /12;
double loanLengthInMonths = loanLengthInYears * 12;

double monthlyPayment = (loanAmount * monthlyInterest) / (1 - Math.pow((1 + monthlyInterest), loanLengthInYears));


System.out.println("MortgageCalculator");
System.out.println("Annual Interest: 5.75%");
System.out.println("Loan Amount: $200,000");
System.out.println("Loan Length: 30 years");
System.out.println(monthlyPayment);

Does this program even compiling? If no, paste here the errors/exceptions.

I get cannot find symbol, identifier expected, and illegal start of type errors

Can you copy the errors and paste here?

I think this is the error Im not very good at this sorry.

Listening on javadebug
Not able to submit breakpoint LineBreakpoint MortgageCalculator.java : 81, reason: The breakpoint is set outside of any class.
Invalid LineBreakpoint MortgageCalculator.java : 81
User program running
User program finished

Well, i don't know why aren't you trying to understand what i mean to say.
Simply,

double annualInterest = 5.75; //This is the annual interest rate
double loanAmount = 200000; //This is the loan amount
double loanLengthInYears = 30; //This is the length of the loan in years
 
 
//Formuals bieng used are:
double monthlyInterest = annualInterest / 100 /12;
double loanLengthInMonths = loanLengthInYears * 12;
 
double monthlyPayment = (loanAmount * monthlyInterest) / (1 - Math.pow((1 + monthlyInterest), loanLengthInYears));
 
 
System.out.println("MortgageCalculator");
System.out.println("Annual Interest: 5.75%");
System.out.println("Loan Amount: $200,000");
System.out.println("Loan Length: 30 years");
System.out.println(monthlyPayment);

paste this piece of code inside main() and then check the closing and opening braces.

Ok thank you... I was closing the code before I had even inputted anything and I had to restart my NetBeans for the code to run. But now the calculation is off and I think it may be within the math. Here are my results:

MortgageCalculator
Annual Interest: 5.75%
Loan Amount: $200,000
Loan Length: 30 years
-6214.908191559089 (I know this should a positive # lol)

I still havnt been able to fix the math yet.... but I noticed I am also getting a gray line under my loanLengthInMonths...the error is not a known variable in the current context

but I noticed I am also getting a gray line under my loanLengthInMonths

It's not an error but it is coz the variable loanLengthInMonths is not being used anywhere after assigning value to it.

Also, i don't know what you are supposed to do, might be the problem in your formulas.

Here is what I am supposed to calculate: Calculate and display the monthly payment amount to fully amortize a $200,000.00 loan over a 30 year term at 5.75% interest. And thank you for all of your help.

I think I just figured it out. Heres the code

public class MortgageCalculator {


public static void main(String[] args) {
double annualInterest = 5.75; //This is the annual interest rate
double loanAmount = 200000; //This is the loan amount
double loanLengthInYears = 30; //This is the length of the loan in years


//Formuals bieng used are:
double monthlyInterest = annualInterest /100/12;
double loanLengthInMonths = loanLengthInYears * 12;

double monthlyPayment = (loanAmount * monthlyInterest) * (1 + Math.pow((1 - monthlyInterest), loanLengthInYears));


System.out.println("MortgageCalculator");
System.out.println("Annual Interest: 5.75%");
System.out.println("Loan Amount: $200,000");
System.out.println("Loan Length: 30 years");
System.out.println(monthlyPayment);
}
}

Good Luck.