ROCKPAPERSCISSORS

import java.util.Scanner;

public class RockPaperScissors {

    public static final String ROCK = "R";
    public static final String PAPER = "P";
    public static final String SCISSORS = "S";

    public static void main(String []args) {
        Scanner input = new Scanner (System.in);

        System.out.print("Enter number of games: ");
        int numberOfGames = input.nextInt();

        while (numberOfGames < 1) {
            System.out.println("Invalid number of games.");
            System.out.print("Enter number of games: ");
            numberOfGames = input.nextInt();
        }

        int rounds = 1;
        int player1Score = 0;
        int player2Score = 0;
        System.out.print("Enter name of Player 1: ");
        String player1 = input.next();

        System.out.print("Enter name of Player 2: ");
        String player2 = input.next();

        do {
            System.out.printf("Round %,d", rounds);
            System.out.printf("\nWhat does %s play? R,P or S: ", player1);
            String player1Choice = input.next().toUpperCase();

            while (!(player1Choice.equals(ROCK) || player1Choice.equals(PAPER) || player1Choice.equals(
                    SCISSORS))) {
                System.out.println("Invalid choice made. Please select only R, P, or S.");
                System.out.printf("What does %s play? R,P or S: ", player1);
                player1Choice = input.next().toUpperCase();
            }

            System.out.printf("What does %s play? R,P or S: ", player2);
            String player2Choice = input.next().toUpperCase();

            while (!(player2Choice.equals(ROCK) || player2Choice.equals(PAPER) || player2Choice.equals(
                    SCISSORS))) {
                System.out.println("Invalid choice made. Please select only R, P, or S.");
                System.out.printf("What does %s play? R,P or S: ", player2);
                player2Choice = input.next().toUpperCase();
            }

            if (player1Choice.equals(player2Choice)) {
                System.out.println("It's a tie.");
            } else if ((player1Choice.equals(ROCK) && player2Choice.equals(SCISSORS)) ||
                    (player1Choice.equals(SCISSORS) && player2Choice.equals(PAPER)) ||
                    (player1Choice.equals(PAPER) && player2Choice.equals(ROCK))) {
                System.out.printf("%s wins!\n", player1);
                player1Score++;
            } else {
                assert ((player2Choice.equals(ROCK) && player1Choice.equals(SCISSORS)) ||
                        (player2Choice.equals(SCISSORS) && player1Choice.equals(PAPER)) ||
                        (player2Choice.equals(PAPER) && player1Choice.equals(ROCK)));
                System.out.printf("%s wins!\n", player2);
                player2Score++;
            }

            rounds++;

        } while(rounds <= numberOfGames);

        System.out.println();
        System.out.printf("After %,d rounds, ", numberOfGames);
        System.out.println(player1Score>player2Score ? player1 + " wins!" : player2 +
                 " wins!");
    } // end main

}