JAVA Code for the Rock Paper Scissors Program

Hello, people. How are you doing? I want to show off the code for the game of Rock Paper Scissors where it's just one player against the computer; this was a programming challenge from Chapter 5 of Tony Gaddis' Starting Out with Java:Fourth Edition. The program was done during my first programming course at my college called JAVA Programming Level 1.

This is also for any YouTube users who have watched how the JAVA game works. If you people ask any questions, post a comment on this blog, on the original YouTube video (http://www.youtube.com/watch?v=q_BjPjVsMbg)

import javax.swing.JOptionPane;
import java.util.Random;

public class Chapter5RockPaperScissors
{
    public static void main(String[] args)
    {
        String computerSide,
               userSide;

        JOptionPane.showMessageDialog(null, "How about we go \"Rock, Paper, Scissors?\"");
       
        computerSide = ComputerChoice();
        userSide = UserChoice();
       
        if (userSide != null)
        {
            JOptionPane.showMessageDialog(null, "The computer's choice is " + computerSide + ".");
           
            Winner(computerSide, userSide);
        }
       
        else
            JOptionPane.showMessageDialog(null, "Error: Improper User Entry. Please enter either" +
                                        " 'rock', 'paper', or 'scissors'.");
    }
   
    public static String ComputerChoice()
    {
        byte computerChoice;
       
        String computerChoiceString = "";
       
        Random choiceGenerator = new Random();
       
        computerChoice = (byte)(choiceGenerator.nextInt(3) + 1);
       
        switch (computerChoice)
        {
       
            case 1:
            {
                computerChoiceString = "rock";
                break;
            }
       
            case 2:
            {
                computerChoiceString = "paper";
                break;
            }
       
            case 3:
            {
                computerChoiceString = "scissors";
                break;
            }
       
        }
       
        return computerChoiceString;
    }
   
    public static String UserChoice()
    {
        String userChoice,
               userChoiceLowerCase;
       
        userChoice =
                JOptionPane.showInputDialog("What object are you going for?");
       
        if (userChoice.equalsIgnoreCase("rock") || userChoice.equalsIgnoreCase("paper")
                || userChoice.equalsIgnoreCase("scissors"))
        {
            userChoiceLowerCase = userChoice.toLowerCase();
        }
       
        else
            userChoiceLowerCase = null;
       
        return userChoiceLowerCase;
    }
   
    public static void Winner(String computerSide, String userSide)
    {
       
        if (computerSide.equals(userSide))
            JOptionPane.showMessageDialog(null, "The game has to be played again, because we have a tie.");
       
        else if (computerSide.equalsIgnoreCase("rock") && userSide.equalsIgnoreCase("paper"))
            JOptionPane.showMessageDialog(null, "You win. Paper covers rock.");
       
        else if (computerSide.equalsIgnoreCase("rock") && userSide.equalsIgnoreCase("scissors"))
            JOptionPane.showMessageDialog(null, "You lose. Rock crushes scissors.");
       
        else if (computerSide.equalsIgnoreCase("paper") && userSide.equalsIgnoreCase("rock"))
            JOptionPane.showMessageDialog(null, "You lose. Paper covers rock.");
       
        else if (computerSide.equalsIgnoreCase("paper") && userSide.equalsIgnoreCase("scissors"))
            JOptionPane.showMessageDialog(null, "You win. Scissors cuts paper.");
       
        else if (computerSide.equalsIgnoreCase("scissors") && userSide.equalsIgnoreCase("rock"))
            JOptionPane.showMessageDialog(null, "You win. Rock crushes scissors.");
       
        else
            JOptionPane.showMessageDialog(null, "You lose. Scissors cuts paper.");
    }
}

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