Mortgage Armortization Calculator

Ok I am trying to get this code to work. I want an armotized morgage calculator the shows the date, monthly interest, montly payment, and principal for 360 months. When I run this code it just gives me the same number. I am confused. I think the println is incorrect but not sure what to do. I have seen another question posted but the code was too complicated for me to understand. I just want to keep it very simple.

Thanks

import java.lang.Math; // Math library
import java.text.NumberFormat; // Number formatting
import java.io.*;

public class MortgCalc
      {
      public static void main (String[] args)
            {
            /*setting variables*/

            double principal = 200000;
            double interest_rate = 5.75;
            double term = 360;
            double payment;
            double MonthlyPerc;
            double LoanAmt = principal;
            double Monthly_principal;
            double Monthly_interest;

            /*formula*/

            MonthlyPerc = (interest_rate /12 * .01); // converts interest rate into months

            payment = principal * MonthlyPerc / (1 - Math.pow(1 + MonthlyPerc, -term));

            /*Formats the payment*/

            NumberFormat result_formatter;
                             result_formatter = NumberFormat.getCurrencyInstance();
                          String result_output;
                          result_output = result_formatter.format(payment);

            /*loop*/

            for (int i=1; i < 361; i++)
            {
            Monthly_principal = (payment -(LoanAmt * MonthlyPerc));
            Monthly_interest = (LoanAmt * MonthlyPerc);            

            /*Screen Display*/

            System.out.println(Monthly_principal + Monthly_interest + payment-Monthly_principal);
            }
      }
      }