Rock Paper Scissors game in java using JOptionPane

Question

I'm trying to solve this assignment for our subject. I've already tried it without using the JOptionPane and it worked, but when I edited it to have a dialog box, it didn't worked. The first dialog box should contain a title and the choices to be inputted, the last one should enable the user to quit the program. After the user enter his/her choice, a dialog box should appear indicating the user's choice and the computer's choice. The computer's choice should be random. If ever the user didn't input a correct option, a dialog box would appear telling the user to input a valid option. This is what I have so far:

package assignment;

import java.util.Random;
import java.util.Scanner;
import javax.swing.*;
public class RockPaperScissorGame 
{



public static void main(String[] args) 
{

    String inputStr;
    String personPlay="";    
    String computerPlay="1,2,3";     
    int computerInt;
   Scanner input = new Scanner(System.in);
    Random generator = new Random();


            inputStr = JOptionPane.showInputDialog("Lets play a game! \nEnter 1 for rock \nEnter 2 for paper \nEnter 3 for scissors \nEnter 4 to quit");
            personPlay = input.next(inputStr);

            switch (computerInt = 0)
            {
                }
            do
            {
                if (personPlay.equals(computerPlay))  
                    JOptionPane.showMessageDialog(null, "It's a TIE! ", "TIE!", JOptionPane.INFORMATION_MESSAGE);

                else if (personPlay.equals("1"))
                    {
                    if (computerPlay.equals("3"))
                    JOptionPane.showMessageDialog(null, "Rock beats Scissors. \nYOU WIN! ", "YOU WIN!", JOptionPane.INFORMATION_MESSAGE);
                    else
                    JOptionPane.showMessageDialog(null, "Paper beats Rock. \nYOU LOSE! ", "YOU LOSE!", JOptionPane.INFORMATION_MESSAGE);
                    }
                else if (personPlay.equals("2"))
                    {
                    if (computerPlay.equals("3"))
                    JOptionPane.showMessageDialog(null, "Scissor beats Paper. \nYOU LOSE!", "YOU LOSE!", JOptionPane.INFORMATION_MESSAGE);
                    else
                    JOptionPane.showMessageDialog(null, "Paper beats Rock. \nYOU WIN! ", "YOU WIN!", JOptionPane.INFORMATION_MESSAGE);
                    }
                else if (personPlay.equals("3"))
                    {
                     if (computerPlay.equals("1"))
                    JOptionPane.showMessageDialog(null, "Scissor beats Paper. \nYOU WIN!", "YOU WIN!", JOptionPane.INFORMATION_MESSAGE);
                     else
                    JOptionPane.showMessageDialog(null, "Rock beats Scissors. \nYOU LOSE! ", "YOU LOSE!", JOptionPane.INFORMATION_MESSAGE);
                    }
                else if (personPlay.equals("4"))
                    {
                    JOptionPane.showMessageDialog(null, "GOOD BYE", " BYE!", JOptionPane.INFORMATION_MESSAGE);
                    }


            }while(true);
            }   

}

Hope you guys can help. Thank you :)

Answer 1

• As pointed out, you never change computerPlay, which is supposed to be randomly chosen.
• The showInputDialog should be inside the loop, otherwise the game never ends...
• The switch is useless.
• So is the Scanner. Just do: personPlay = JOptionPane.showInputDialog("Lets play a game! [...]");