/*
 * File: Magic8Ball.java
 *
 * THE MAGIC 8-BALL IS A REGISTERED TRADEMARK OF THE MATTEL CORPORATION
 *
 * CopyRight:  Greg Shaw, 11/13/2010
 * 
 * Reviews ArrayLists and random numbers
 */
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JOptionPane;

/**
 * This class implements a digital version of the world-famous prognosticating
 * device.  The answers must first be added to the list by calling method
 * addAnswer once for each answer
 *
 * @author Greg
 */
public class Magic8Ball 
{
   // instance var's
   private ArrayList<String> answers ;                // list of answers
   private static Random generator = new Random();

   /**
    * Create a Magic8Ball object
    */
   public Magic8Ball()
   {
      answers = new ArrayList<String>() ;             // create empty list
   }

   /**
    * Add an answer to the list
    * @param answer an answer to be added
    */
   public void addAnswer(String answer)
   {
      answers.add(answer);    // call add method of ArrayList class
   }

   /**
    * Display a randomly-chosen answer to a "Yes or No" question
    */
   public void answerQuestions()
   {
      String question = JOptionPane.showInputDialog("Ask me a YES/NO question "
                                                     + "(Cancel to quit)") ;
      while (question != null)      // while more questions
      {
         // get a randon int between 0 and one less than the size of the list
         int index = generator.nextInt(answers.size());
         
         // get the answer at position "index" on the list
         String message = answers.get(index);

         System.out.println(message);
         JOptionPane.showMessageDialog(null, message);
         question = JOptionPane.showInputDialog("Next question? "
               + "(Cancel to quit)\n(You don't have to type the "
               + "question - I can read your mind!)\nThey don't call "
               + "me MAGIC for nothin'!");
      }
      // here at eof - display disclaimer
      String disclaimer = "Answers given are the opinions of the Magic "
            + "8-Ball only \nand do not represent the views of your computer, "
            + "Greg, \nthe School of Computing and Information Sciences, \n"
            + "Florida International University, or any other entity, \n"
            + "biological or not.";
      JOptionPane.showMessageDialog(null, disclaimer);
   }
}