Question

(Java)

Write a program that lets the user play the game of Rock, Paper, Scissors against the computer. The program should work as follows.

When the program begins, a random number in the range of 1 through 3 is generated. If the number is 1, then the computer has chosen rock. If the number is 2, then the computer has chosen paper. If the number is 3, then the computer has chosen scissors. Don’t display the computer’s choice yet.

The user enters his or her choice of “rock”, “paper”, or “scissors” at the keyboard. 3. The computer’s choice is displayed.

A winner is selected according to the following rules:

• If one player chooses rock and the other player chooses scissors, then rock wins. The rock smashes the scissors.

• If one player chooses scissors and the other player chooses paper, then scissors wins. Scissors cuts paper.

• If one player chooses paper and the other player chooses rock, then paper wins. Paper wraps rock.

• If both players make the same choice, the game must be played again to determine the winner. Be sure to divide the program into methods that perform each major task. Here is the description of the methods you should implement:

• public static String computerChoice() – This method will return the computer’s choice of “rock”, “paper”, or “scissors”.

• public static String userChoice () – This method will return the user’s choice of “rock”, “paper”, or “scissors” after validating the user’s choice using isValidChoice method.

• public static boolean isValidChoice (String choice) – This method will take a String holding the user’s choice as parameter and return true if the choice is valid (“rock”, “paper”, or “scissors”), false otherwise. Be sure that the comparison is not case sensitive.

• public static void determineWinner(string computer,string user)– This method will take both the choices as parameter and display the winner.

Call the method isValidChoice() in a while loop in the userChoice() method to verify that the choice that user enters must be “rock”, “paper”, or “scissors”. If invalid string is input, isValidChoice()will return false and the program should ask for new input until the valid input is given.

The user is allowed to play the game as often as desired.

Answer 1

import java.util.Scanner;

//import java.util.Scanner;

import javax.swing.JOptionPane;

public class Game {

public static void main(String[] args) {

// TODO Auto-generated method stub

// create the choice variable and ask the user to enter the input

Scanner sc = new Scanner(System.in);

String choice;

char ch = 'Y';

String winner = " ";

int computerChoice = 0;

do {

//choice = JOptionPane.showInputDialog("Please enter rock, paper, or scissor: ");

System.out.println("Please enter rock, paper, or scissor: ");

choice = sc.nextLine();

if (isValid(choice)) {

computerChoice = (int) (Math.random() * 3 + 1);

// System.out.println(aIChoice);

int personChoice = getValue(choice);

winner = whoWin(personChoice, computerChoice);

System.out.println("You picked " + choice);

System.out.println("Computer picked " + getAIChoice(computerChoice));

System.out.println("You " + winner);

System.out.println("Do you wish to continue (Y/N): ");

ch = sc.nextLine().charAt(0);

} else {

System.out.println("Invalid input. Please try again.");

}

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

// console.close();

}

// check the user enters the valid values

public static boolean isValid(String string) {

if (string.equalsIgnoreCase("rock")) {

return true;

}

if (string.equalsIgnoreCase("paper")) {

return true;

}

if (string.equalsIgnoreCase("scissor")) {

return true;

}

return false;

}

// assign the value for computer choice

public static String getAIChoice(int x) {

if (x == 1) {

return "rock";

}

if (x == 2) {

return "paper";

} else {

return "scissor";

}

}

// convert the user inputs to 1, 2, 3

public static int getValue(String string) {

if (string.equalsIgnoreCase("rock")) {

return 1;

}

if (string.equalsIgnoreCase("paper")) {

return 2;

} else {

return 3;

}

}

// create the whoWin method to determine who win

public static String whoWin(int userChoice, int pcChoice) {

// 1 == rock

// 2 == paper

// 3 == scissor

if (userChoice == 1) {

if (pcChoice != 2) {

if (pcChoice != 1) {

return "win.";

}

return "tie.";

}

return "loose.";

}

if (userChoice == 2) {

if (pcChoice != 3) {

if (pcChoice != 2) {

return "win.";

}

return "tie";

}

return "loose.";

}

if (userChoice == 3) {

if (pcChoice != 1) {

if (pcChoice != 3) {

return "win.";

}

return "tie.";

}

return "loose.";

}

return "";

}

}

================================================

SEE OUTPUT

PLEASE COMMENT if there is any concern.

==============================

============================