Stack Overflow - 19204872

/**
 *
 */
package com.shreesoft.game;

import java.util.Random;
import java.util.Scanner;

/**
 * @author srihari
 *
 */
public class Game {

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

    /**
     * @param args
     */
    public static void main(String[] args) {
        String response = null;
        Scanner scan = new Scanner(System.in);
        System.out.println(
                "Hey, let's play Rock, Paper, Scissors!\n"
                + "Please enter a move.\n"
                +"Rock = R, Paper= P, and Scissors = S.\n");
        //loop through till the user is entering input
        while (scan.hasNext()) {
            System.out.println("Enter your play: ");
            response = scan.next().toUpperCase();
            if (response.equals(PAPER) || response.equals(ROCK)
                    || response.equals(SCISSORS)) {
                printDescision(response, getComputerPlay());
            } else {
                //exit game if user entered invalid input
                System.out.println("Invalid Input " + response);
                System.out.println("Exiting Game");
                scan.close();
                System.exit(0);
            }
        }
    }
    /**
     * decide the winner
     * */
    public static void printDescision(String personPlay, String computerPlay) {
        System.out.println("Computer play is: " + computerPlay);

        if (personPlay.equals(computerPlay))
            System.out.println("It's a tie!");
        else if (personPlay.equals(ROCK)) {
            if (computerPlay.equals(SCISSORS))
                System.out.println("Rock crushes scissors. You win!!");
            else if (computerPlay.equals(PAPER))
                System.out.println("Paper eats rock. You lose!!");
        } else if (personPlay.equals(PAPER)) {
            if (computerPlay.equals(SCISSORS))
                System.out.println("Scissor cuts paper. You lose!!");
            else if (computerPlay.equals(ROCK))
                System.out.println("Paper eats rock. You win!!");
        } else if (personPlay.equals(SCISSORS)) {
            if (computerPlay.equals(PAPER))
                System.out.println("Scissor cuts paper. You win!!");
            else if (computerPlay.equals(ROCK))
                System.out.println("Rock breaks scissors. You lose!!");
        } else
            System.out.println("Invalid user input.");
    }
    /**
     * get computer's move
     * */
    public static String getComputerPlay(){
        int computerInt;
        String computerPlay="";
        Random generator = new Random();
        computerInt = generator.nextInt(3) + 1;
        if (computerInt == 1)
            computerPlay = ROCK;
        else if (computerInt == 2)
            computerPlay = PAPER;
        else if (computerInt == 3)
            computerPlay = SCISSORS;

        return computerPlay;
    }

}