Question

Java) Write a program to score the rock-paper-scissor game. Each of two users types in either R, P, S or Q to quit. The program then announces the winner as well as the basis for determining the winner: Paper covers rock, Rock breaks scissors, Scissors cut paper, or a Tie game. Allow the user to use lowercase as well as uppercase letters. Your program should loop until the user types a 'Q' to quit.

In the sample code, the game is enclosed within a do…while loop that keeps repeating while the user enters a 'Y' in response to the prompt "Do you want to play again? " The program exits if anything other than an upper-case or lower-case 'Y' is entered. For extra credit, add additional code at the end of the program to keep asking "Do you want to play again? " until the user enters either a 'Y' or 'N' and rejects any other response.(NEEDED)

Answer 1

If you have any doubts, please give me comment...

import java.util.Scanner;

import java.util.Random;

public class RockPaperScissors {

    public static void main(String[] args) {

        final char ROCK = 'R';

        final char PAPER = 'P';

        final char SCISSORS = 'S';

        final char QUIT = 'Q';

        Scanner scnr = new Scanner(System.in);

        char choice;

        String player2Material = "";

        String player1Material = "";

        int player1Choice = 0;

        int player2Choice = 0;

        boolean invalidChoice;

        do {

            invalidChoice = true;

            System.out.println("Play!\nEnter: R (rock), P (paper), S (scissors), Q (Quit)\n");

            while (invalidChoice) {

                invalidChoice = false;

                System.out.print("Player 1 choice: ");

                player1Choice = scnr.next().toUpperCase().charAt(0);

                switch (player1Choice) {

                case ROCK:

                    player1Material = "rock";

                    break;

                case PAPER:

                    player1Material = "paper";

                    break;

                case SCISSORS:

                    player1Material = "scissors";

                    break;

                case QUIT:

                    System.out.println("Player 1 quit the game");

                    System.exit(0);

                    break;

                default:

                    System.out.println("Invalid choice!");

                    invalidChoice = true;

                }

            }

            invalidChoice = true;

            while (invalidChoice) {

                System.out.print("Player-2 choice: ");

                player2Choice = scnr.next().toUpperCase().charAt(0);

                invalidChoice = false;

                switch (player2Choice) {

                case ROCK:

                    player2Material = "rock";

                    break;

                case PAPER:

                    player2Material = "paper";

                    break;

                case SCISSORS:

                    player2Material = "scissors";

                    break;

                case QUIT:

                    System.out.println("Player 2 quit the game");

                    System.exit(0);

                    break;

                default:

                    System.out.println("Invalid choice!");

                    invalidChoice = true;

                }

            }

            System.out.println("\nPlayer 1 chooses " + player1Material + ".");

            System.out.println("Player 2 chooses " + player2Material + ".");

            if (player2Choice == player1Choice) {

                System.out.println("Tie!");

            } else if ((player2Choice == ROCK && player1Choice == SCISSORS)

                    || (player2Choice == PAPER && player1Choice == ROCK)

                    || (player2Choice == SCISSORS && player1Choice == PAPER)) {

                System.out.println("Player 2 wins!");

            } else {

                System.out.println("Player 1 wins!");

            }

            System.out.print("\nDo you want to play again? ");

            choice = scnr.next().charAt(0);

        } while (choice == 'Y' || choice == 'y');

    }

}