Using GUI Via JOption Pane With Program

We needed to use a GUI via JOptionPane with our program. So that we may turn out programs in as executable jar files. However, I have never used it. Here is my problem and code:

package waitingroomlinkedlist;
import java.util.Scanner;
import javax.swing.JOptionPane;
 public class WaitingRoomLinkedList {
  public static void main(String args[]) {
boolean done = false;
String inputFirst;
String inputLast;
  String[] choices = {"First Name", "Last Name", "Quit"};

[Code] ....

Now for some reason I am getting an error when trying to create a new instance of the Person class and pass inputFirst and inputLast. Its telling me that I have not initialized inputFirst or Last. When I allow it to initialize it sets inputFirst = null; and so forth with inputLast. All I want to do is pass the two Strings to my constructor in my Person class.