Thread: Object Oriented program, no output

Hello,

this is a homework assignment, but it has already been turned in. I can't figure out why it does not produce any output. The code compiles fine, but when I run it all I get is "press any key to continue." This tells me the program ran, but my output isn't.

I've tried moving things around, but if I move my println statements to main, I get errors about a non-static value in a static method, so I'm stumped.

Can anyone give me a shove in the right direction towards fixing this thing? I want to learn what I did wrong so I can fix it and move forward on my next assignment.

Thanks!

Here's the code:

import java.io.PrintStream;
 
public class MortgageCalc
{
 
private double loanAmount=0;
private int years=0;
private double interestRate=0;
public double monthPay=0;
 
 
public MortgageCalc (double loanAmount, int years, double interestRate)
	{
	 this.loanAmount = loanAmount; // set the variables
	 this.years = years;
	 this.interestRate = interestRate;
 
}
 
public double calculations()
{
	monthPay= ((loanAmount*(interestRate/12)) / (1 - 1 /Math.pow((1 + interestRate*12), years)));// calculation for monthly payment
	return monthPay;
}
 
public void display()
{
	System.out.println("Mortgage Payment Calculator"); // should print out the title, but doesn't
	System.out.println("The amount of the loan $200,000"); // should print out the loan amount, but doesn't
	System.out.println("The term of the loan is 30 years"); // should print out the loan term, but doesn't
	System.out.println("The interest rate of the loan is 5.75%"); //should print out the loan rate, but doesn't
	System.out.println(); // should leave a blank line, but doesn't
	System.out.println("The monthly payment is: $" + monthPay ); //should print out the monthly payment, but doesn't
	System.out.println();// should leave a blank line, but doesn't
 
}
 
public static void main(String[] args)
{
	MortgageCalc mortgageCalc = new MortgageCalc(200000,30,0.0575);// create the values for the calculation
 
}
}

THANK YOU!! I believed that it had to be something simple and a newbie error, but I could not figure out what.

I had tried using an object in the calculation using

("The monthly payment is: $\n", new Object[] { Double.valueOf(calculations())} );

, but someone at another Java forum (which shall be nameless) said it was overkill and not to do it. Oh well, I'm sure it was good advise, I probably just misunderstood.

Thank you so much! My instructor in the course has not been of much (OK, any) assistance and I was wondering if I was totally off base, or even in the ballpark.

I made the changes you suggested and it runs and displays correctly!!!

Thanks again!!!