# Need help please

• January 5th, 2012, 11:23 PM
kprofgold
Hi I am new to Java and have no clue what I am doing and I think my book is confusing me more than it is helping me. Here is what I need to do. Write the program in Java (without a graphical user interface) using a loan amount of \$200,000 with an interest rate of 5.75% and a 30 year term. Display the mortgage payment amount and then list the loan balance and interest paid for each payment over the term of the loan. If the list would scroll off the screen, use loops to display a partial list, hesitate, and then display more of the list. I know that I am supposed to create a loop but I have no clue how to do this correctly or even if the math portion of it is correct. I need some guidance please and also please try to tell me in a way that I can understand. And try not to laugh to much at my code lol. Here is what I have attempted so far:

public class MortgageCalculator {
private static double interest;

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), -loanLengthInMonths));
DecimalFormat decimalPlaces=new DecimalFormat("0.00");//Rounds up the dollar amount

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: " + decimalPlaces.format(monthlyPayment));

double currentLoanAmount;
currentLoanAmount = loanAmount;
while (currentLoanAmount >= 0.10)
double interestPayment;
interestPayment = (currentLoanAmount * monthlyInterest);
double currentLoanAmount = currentLoanAmount - (monthlyPayment - interestPayment)

System.out.println("loanAmount");
System.out.println("Interest Payment");

}
}
• January 5th, 2012, 11:48 PM
elisha.java
Re: Need help please
You should check out some tutorials online to learn the basics. You cannot enclose variables in double quotes and expect to print out their values unless they are statements (Strings). After storing values in variables, all you need is to print that variable name and its content will be printed out.
• January 6th, 2012, 12:09 AM
kprofgold
Re: Need help please
Ive been looking online for the last week trying to figure it out... its just really confusing. Once I got the first formula I was able to come up with the first section but once I was required to input the loan balance and interest payments I got stuck. Ill keep looking though.