Turning this program into a GUI

[NAN47]

Can someone please explain to me how to turn this program into a GUI? Thanks.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.Toolkit;
import javax.swing.JOptionPane;
import java.io.IOException;
import java.io.*;
import java.util.Date;
import java.text.*; //Declares the java import for accomplishing mathematical logic and float numbers

public class newprogram3 //public class for java
{//begin logic for string arguments (main)

public static void main(String[] args)//throws exception for possible user input error
{//begin logic for program

getinput();
finish();

}

public static void Titles()
{
System.out.println("\tBalance\t\t\tPayments\t\tInterest\n\n");
}


public static void getinput()
{
int input = 0;
final double interest[] = {5.35, 5.5, 5.75};
final int AmountTerm[] = {7, 15, 30};
double monthlyPayment[] = new double[3];
int Add = 1;
String amount = ("Enter the loan amount for amoritization list\n(do not use commas or dollar signs)\n or click cancel to exit:");
if(amount == null) finish();
double loanAmount = Double.parseDouble(JOptionPane.showInputDialog(null, amount));
double interestPaid = 0.0, principalPaid = 0.0, loanBalance = loanAmount;
DecimalFormat df = new DecimalFormat("$#,###.00");
boolean done = false;
double GetmonthlyPayment= 0;
int GetAmountTerm = 0;
double Getinterest = 0;
for(int i = 0; i<3; i++)
{//beginning loop for display

monthlyPayment[i] = (loanAmount * ((interest[i]/100)/12)) / (1-1 / Math.pow((1 + (interest[i]/100)/12),AmountTerm[i] * 12));

while (!done)
{

try
{
String message = "Select an interest rate:" + "\n\n1) Interest rate of " +interest[0]+ "%\n2) Interest rate of " +interest[1]+ "%\n3) Interest rate of " +interest[2]+ "%\n4) Quit\n";
input = Integer.parseInt(JOptionPane.showInputDialog(null, message));
if (input<1 || input>4) throw new NumberFormatException();
else done = true;
if(input == 4) finish();

switch(input)
{
case 1: JOptionPane.showMessageDialog(null,"\n\tYou selected option "+ input + ".\n");
GetmonthlyPayment = monthlyPayment [i];
Getinterest = interest[i];
GetAmountTerm = AmountTerm[i];
JOptionPane.showMessageDialog(null,"\n\tHere is the amoritization for option "+ input + ".\n");
break;

case 2: JOptionPane.showMessageDialog(null,"\n\tYou selected option "+ input + ".\n");
GetmonthlyPayment = monthlyPayment [i];
Getinterest = interest[i];
GetAmountTerm = AmountTerm[i];
JOptionPane.showMessageDialog(null,"\n\tHere is the amoritization for option "+ input + ".\n");
break;

case 3: JOptionPane.showMessageDialog(null,"\n\tYou selected option "+ input + ".\n");
GetmonthlyPayment = monthlyPayment [i];
Getinterest = interest[i];
GetAmountTerm = AmountTerm[i];
JOptionPane.showMessageDialog(null,"\n\tHere is the amoritization for option "+ input + ".\n");
break;

}//end of try

}//end of switch

catch (NumberFormatException e)
{
Toolkit.getDefaultToolkit().beep();
JOptionPane.showMessageDialog(null,"Please enter a 1, 2, 3 or 4.", "ERROR", JOptionPane.ERROR_MESSAGE);
}//end of catch

}//end loop

}//end of for loop

do{
//pause program after 35 entries are displayed, wait for user to hit enter key.
if(Add % 10== 0)
{
temporaryHold();
Titles();//reprint header columns for each set of records
}


double interestPayment = 0.0;
double primaryPayment = 0.0;

primaryPayment = GetmonthlyPayment;
interestPayment = Getinterest;


//Calculate interest paid & principal paid
interestPaid = (loanBalance * (interestPayment/100))/12;
principalPaid = primaryPayment - interestPaid;



//Output Values and Mortgage Payment Results
System.out.println(Add +"\t" + df.format(loanBalance)
+ "\t\t" + df.format(principalPaid)
+ "\t\t" + df.format(interestPaid)+"\n");

//calculate new loan balance and increment the counter
loanBalance = loanBalance - principalPaid;
Add++;

}while (Add <= loanBalance); //end while statement
Toolkit.getDefaultToolkit().beep();
gotomain();//asks user to make a decision

}//end amoritization



//declares temporary hold method
public static void temporaryHold()
{
JOptionPane.showMessageDialog(null,"\nHit OK button to see results.");
}

public static void gotomain()
{
JOptionPane.showConfirmDialog(null,"\nWould you like to return to the main menu? ");
}

public static void finish()
{
System.exit(0);






}//end main

}//end program

[IceCubeC]

with this program you could use a JTextArea with JScrollPane

here's a simple example:
http://www.leepoint.net/notes-java/G...-textarea.html