4.7.11

public class RockPaperScissors extends ConsoleProgram
{
    private static final String USER_PLAYER = "User wins!";
    private static final String COMPUTER_PLAYER = "Computer wins!";
    private static final String TIE = "Tie";

    /**
     * Function: getWinner
     *
     * Parameters:
     * String user - a string holding the choice that the user player
     * made. Must either be "rock", "paper", or "scissors"
     * String computer - a string holding the choice that the computer
     * player made. Must either be "rock", "paper", or "scissors"
     *
     * Determines the winner based on the rules of rock paper scissors.
     * Rock beats scissors and loses to paper
     * Paper beats rock and loses to scissors
     * Scissors beats paper and loses to rock
     * Identical choices tie
     *
     * Return: a string holding a message describing the winner, either
     * USER_PLAYER, COMPUTER_PLAYER, or TIE
     */
    private String getWinner(String user, String computer)
    {
        if(user.equals(computer))
        {
            return TIE;
        }
        if(user.equals("rock") && computer.equals("paper"))
        {
            return COMPUTER_PLAYER;
        }
        if(user.equals("rock") && computer.equals("scissors"))
        {
            return USER_PLAYER;
        }
        if(user.equals("paper") && computer.equals("rock"))
        {
            return USER_PLAYER;
        }
        if(user.equals("paper") && computer.equals("scissors"))
        {
            return COMPUTER_PLAYER;
        }
        if(user.equals("scissors") && computer.equals("rock"))
        {
            return COMPUTER_PLAYER;
        }
        return USER_PLAYER;
    }

    public void run()
    {
        while(true){
            //Get the user's choice
            String choice = readLine("Enter your choice (rock, paper, or scissors): ");
            choice = choice.toLowerCase();

            //End the game if the user entered a blank line
            if(choice.equals("")){
                break;
            }

            //Make sure it was a valid choice
            if(choice.equals("rock") || choice.equals("paper") || choice.equals("scissors")){
                //Print the user choice
                System.out.println("User: " + choice);

                //Get the computer random choice
                int compChoiceNum = Randomizer.nextInt(0,2);
                String compChoice = "";
                if (compChoiceNum == 0)
                {
                    compChoice = "rock";
                }
                else if (compChoiceNum == 1)
                {
                    compChoice = "paper";
                }
                else
                {
                    compChoice = "scissors";
                }

                //Print the computer choice
                System.out.println("Computer: " + compChoice);

                //Print the winner
                System.out.println(getWinner(choice, compChoice));
            }

            else{
                System.out.println(choice + "is not a valid move. Please try again");
            }
        }

        //End the game with a nice message
        System.out.println("Thanks for playing!");
    }
}


/*
//Print the user choice
                System.out.println("User: " + choice);

                //Get the computer random choice
                String[] compChoices = new String[]{"rock", "paper", "scissors"};
                int compChoiceNum = Randomizer.nextInt(0, 2);
                String compChoice = compChoices[compChoiceNum];

                //Print the computer choice
                System.out.println("Computer: " + compChoice);

                //Print the winner
                System.out.println(getWinner(choice, compChoice));
            }
*/