Help pausing screen output....

Question

My teacher has instructed us to write a program that calculates loan payments on a 200,000 loan at 5.75% interest for 30 years. I have completed this just fine. The second part of the exercise is to have it output to screen the amount of each payment that is made and the amount of interest paid with each payment. I have this working as well. The part I am stuck on though is making my screen output pause by hitting anykay after say 20 lines are written to the screen. Right now it shows all the payments as one huge scrolling page.
I have looked for several hours now for a way to do this and I am completly stuck.
Could someone show me what I would do to get this to work?
I will post the code below:
     Date:                    October 23, 2006
     Programmer:          Shawn McBride
     Class:               POS/406
     Facilitator:     Dr. Wayman Johnson
     Program:               mort_calc2
     Purpose:               Calculate and display the monthly payment amount to fully amoritize a
                              $200,000.00 loan at 5.75% for 30 years.
import java.text.NumberFormat;
import java.util.Locale;
import java.util.Scanner;
import java.io.*;
public class mort_calc2
     public static void main(String[] args)
          // declare all variables
               double TotalLoanAmount = 200000.00;
               double Term       = 30;
               double InterestRate   = 5.75;
               double MonthRate  = 0;
               double MonthlyPayment    = 0;
               double NumPayment = 0;
               double LoanBalance = TotalLoanAmount;
               double InterestPaid = MonthRate * LoanBalance;
               double PrinciplePaid = MonthlyPayment - InterestPaid;
               double CurrentBalance = TotalLoanAmount;
               int PaymentNum = 0;
               int Counter = 1;
               // calculate number of payments and monthly interest rate
               MonthRate  = (InterestRate / 100 / 12);
               NumPayment = (Term * 12);
                //currency formatter
               NumberFormat myCurrencyFormatter;
               myCurrencyFormatter = NumberFormat.getCurrencyInstance(Locale.US);
               // calculate monthly payment
               MonthlyPayment = (TotalLoanAmount * Math.pow((1 + MonthRate),NumPayment) * MonthRate)/
                       (Math.pow((1 + MonthRate),NumPayment) - 1);
          // Calculate and display the Payment amoun, loan balance, and interest paid for each payment
          for (PaymentNum = 1;PaymentNum <= NumPayment -1;PaymentNum++)
         InterestPaid = MonthRate * LoanBalance;
               PrinciplePaid = MonthlyPayment - InterestPaid;
               LoanBalance = LoanBalance - PrinciplePaid;
          System.out.println("\nYour Monthly Payment is: " + myCurrencyFormatter.format(MonthlyPayment) + "\nAfter Payment#: " + PaymentNum + " Your Current Balance is: " + myCurrencyFormatter.format(LoanBalance));
       if(InterestPaid > 0)
                         System.out.println("The Amount of interest you have paid is "  + myCurrencyFormatter.format(InterestPaid));
               //Below is thhe part I am trying to get to work based on my research so far. But the problem is I get errors
               // it. It keeps saying "cannot find symbol Symbol: variable stdin.
                    /* if (Counter == 20)
                              stdin.nextLine();
                             Counter = 1;
                              Counter++;
               System.out.println("\nYour Last Monthly Payment is: " + myCurrencyFormatter.format(LoanBalance));     
                         System.out.println("The Amount of interest you pay for your last payment is "  + myCurrencyFormatter.format(InterestPaid - MonthRate * LoanBalance));
          } // end main
} // end mort_calc2.java

Answer 1

couple of ways
class Testing
  public Testing()
    for(int x = 0; x < 100; x++)
      System.out.println(x);
      if(x > 0 && x % 25 == 0)
        System.out.print("Press [ENTER] to continue...");
        try
          System.in.read();
          System.in.skip(System.in.available());
        catch(Exception e){e.printStackTrace();}
  public static void main(String[] args){new Testing();}
}or, if you are running the program via the command line, use the more switch
c:\>java Testing|more