*3.17 ( Game: scissor, rock, paper ) Write a program that plays the popular scis

Question

*3.17 (Game: scissor, rock, paper) Write a program that plays the popular scissor-rockpaper

game. (A scissor can cut a paper, a rock can knock a scissor, and a paper can

wrap a rock.) The program randomly generates a number 0, 1, or 2 representing

scissor, rock, and paper. The program prompts the user to enter a number 0, 1, or

2 and displays a message indicating whether the user or the computer wins, loses,

or draws. Here are sample runs:

scissor (0), rock (1), paper (2): 1

The computer is scissor. You are rock. You won

scissor (0), rock (1), paper (2): 2

The computer is paper. You are paper too. It is a draw

Explanation / Answer

import java.util.Scanner;   // java library to scan user input
import java.util.Random;   // java library to generate random numbers
import java.util.*;           // java library for using hashmap

/* Java program to play the popular scissor-rockpaper
game.
*/

public class Whowins
{
   public static void main(String args[])
   {
       // Random class is used to generate random numbers
       Random random = new Random();
       // declare variables
       int user;

       // declare a generic hashmap having Integer type key and String type value.
       Map<Integer, String> hm = new HashMap<>();
      
       // add key-value pair in hashmap as 0-scissor, 1-rock and 2-paper
       hm.put(0,"scissor");
       hm.put(1,"rock");
       hm.put(2,"paper");
      
       //Take input from user

       Scanner scanner = new Scanner(System.in);
      
       System.out.print("scissor (0), rock (1), paper (2): ");
       user = scanner.nextInt();
      
       // generate random number in the range of 0 to 2
       int computer = random.nextInt(3);

       // if user and computer are having same outcomes then it is a draw.  
       if(user == computer)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+" too. It is a draw");

       else{

       // observe below conditions carefully to understand who wins at what condition.
       if(user == 0 && computer == 2)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+". You won");
       else if(user == 1 && computer == 0)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+". You won");
       else if(user == 2 && computer == 1)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+". You won");
       else if(computer == 0 && user == 2)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+". Computer won");
       else if(computer == 1 && user == 0)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+". Computer won");
       else if(computer == 2 && user == 1)
           System.out.print("The computer is "+hm.get(computer)+". You are "+hm.get(user)+". Computer won");
       }
   }
}

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