How do you add GUI to this java program?

Ok, I wasn't sure where to post this problem since I don't know if this is classified under the new to java or advanced.

I know only basic stuff in java. And I need to create a GUI for this type of program. It shows your credit card info. It has some other classes and makes use of the rmiregistry. This works fine in console but I need to show it in a GUI. The first thing that promps here is to enter your name (java Shopper localhost *my name*). Then it shows you your credit card info. Can anyone help me? Please and thank you

Code :

import java.rmi.*;
import javax.swing.*;
 
public class Shopper {
    public static void main(String args[])
    {
        CreditManager cm = null;
        CreditCard account = null;
 
        if(args.length<2)
        {
            System.err.println("Usage:");
            System.err.println("java Shopper <server> <accountname>");
            System.exit(1);
        }
        try
        {
            String url = new String("//"+args[0]+"/cardManager");
            System.out.println("Shopper: lookup cardManager, url="+url);
            cm = (CreditManager) Naming.lookup(url);
        }catch(Exception e)
        {
            System.out.println("Error in getting Card Manager "+e);
            System.exit(1);
        }
 
        try
        {
            account = cm.findCreditAccount(args[1]);
            System.out.println("Found account for "+args[1]);
        }catch(Exception e)
        {
            System.out.println("Error in getting acocunt for "+args[1]);
            System.exit(1);
        }
 
        try
        {
 
            	 System.out.println("Available credit is "+account.getCreditLine());
            System.out.println("Changing pin number for account");
            account.setSignature(1234);
            System.out.println("Buying a new watch for $100");
            account.makePurchase(100.0f, 1234);
            System.out.println("Available credit is now "+account.getCreditLine());
            System.out.println("Buying a new pair of shoes for $160");
            account.makePurchase(160.0f, 1234);
            System.out.println("Cardholder: Paying off $136 of balance");
            account.payTowardsBalance(136.0f);
            System.out.println("Available credit is now "+account.getCreditLine());
 
        }catch(Exception e)
        {
            System.out.println("Transaction error for "+args[1]);
        }
 
        System.exit(0);
    }
 
}