Question

Java

Listed below is code to play a guessing game. In the game, two players attempt to guess a number. Your task is to extend the program with objects that represent either a human player or a computer player.

boolean checkForWin (int guess, int answer) {

System.out.println("You guessed" + guess +".");

if (answer == guess) {

System.out.println( "You're right! You win!") ;

return true;

}

else if (answer < guess)

System.out.println ("Your guess is too high.") ;

else

System.out.println ("Your guess is too low.") ;

return false;

}

void play(Player player1, Player player2) {

int answer = 0, guess = 0;

answer = rand.nextInt(100);

boolean win = false;

while (!win) {

System.out.println ("Player 1's turn to guess.") ;

guess = player1.getGuess();

win = checkForWin(guess, answer);

if (win) return;

System.out.println (“Player 2's turn to guess.");

guess = player2.getGuess();

win = checkForWin(guess, answer);

}

}

The play function takes as input two Player objects. Define the Player class with a method named getGuess().The implementation of getGuess() can simply return 0. Next, define a class named HumanPlayer derived from Player. The implementation of getGuess() method in HumanPlayer should prompt the user to enter a number and return the value entered from the keyboard.

Next, define a class named ComputerPlayer derived from Player. The implementation of getGuess() in ComputerPlayer should randomly select a number between 0 and 99. Finally, construct a driver class that invokes play(Player player1, Player player2) with two instances of a HumanPlayer (human versus human), an instance of a HumanPlayer and ComputerPlayer (human versus computer), and two instances of ComputerPlayer (computer versus computer).

Answer 1

CODE:

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

// Base class of the player
class Player{
   public int getGuess() {
       return 0;
   }
}

// inherited class from the player, for human player
class HumanPlayer extends Player{
   public int getGuess() {
       Scanner scan=new Scanner(System.in);
       System.out.println("Human, Please enter a number!: ");
       int num=scan.nextInt();
       return num;
   }
}

//inherited class from the player, for computer player
class ComputerPlayer extends Player{
   public int getGuess() {
       // just return random number between 0 and 99
       return (new Random()).nextInt(100);
   }
}

// Driver class to run the human and computer player
// with different combinations
public class GuessGame {
  
   static Random rand=new Random();
   public static void main(String[] args) {
      
       Player hP=new HumanPlayer();
       Player cP=new ComputerPlayer();
      
       // human vs computer
       System.out.println("-------- Human vs Computer ------");
       play(hP,cP);
      
       // human vs human
       System.out.println("-------- Human vs Human ------");
       play(hP,hP);
      
       // computer vs computer
       System.out.println("-------- Computer vs Computer ------");
       play(cP,cP);
   }
  
   static boolean checkForWin(int guess, int answer) {

       System.out.println("You guessed " + guess + ".");
       if (answer == guess) {
           System.out.println("You're right! You win!");
           return true;
       }

       else if (answer < guess)
           System.out.println("Your guess is too high.");
       else
           System.out.println("Your guess is too low.");
       return false;
   }

   static void play(Player player1, Player player2) {

       int answer = 0, guess = 0;
       answer = rand.nextInt(100);
       boolean win = false;

       while (!win) {
           System.out.println("Player 1's turn to guess.");
           guess = player1.getGuess();
           win = checkForWin(guess, answer);
           if (win)
               return;
           System.out.println("Player 2's turn to guess.");
           guess = player2.getGuess();
           win = checkForWin(guess, answer);
       }
   }

}

RESULT:

-------- Human vs Computer------

Player 1's turn to guess.
Human, Please enter a number!:
45
You guessed 45.
Your guess is too low.
Player 2's turn to guess.
You guessed 4.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
65
You guessed 65.
Your guess is too low.
Player 2's turn to guess.
You guessed 22.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
75
You guessed 75.
Your guess is too low.
Player 2's turn to guess.
You guessed 52.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
85
You guessed 85.
Your guess is too low.
Player 2's turn to guess.
You guessed 14.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
95
You guessed 95.
Your guess is too high.
Player 2's turn to guess.
You guessed 6.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
94
You guessed 94.
Your guess is too high.
Player 2's turn to guess.
You guessed 73.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
93
You guessed 93.
Your guess is too high.
Player 2's turn to guess.
You guessed 84.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
92
You guessed 92.
Your guess is too high.
Player 2's turn to guess.
You guessed 8.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
91
You guessed 91.
You're right! You win!

-------- Human vs Human------
Player 1's turn to guess.
Human, Please enter a number!:
25
You guessed 25.
Your guess is too high.
Player 2's turn to guess.
Human, Please enter a number!:
18
You guessed 18.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
19
You guessed 19.
Your guess is too low.
Player 2's turn to guess.
Human, Please enter a number!:
20
You guessed 20.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
21
You guessed 21.
Your guess is too low.
Player 2's turn to guess.
Human, Please enter a number!:
22
You guessed 22.
Your guess is too low.
Player 1's turn to guess.
Human, Please enter a number!:
23
You guessed 23.
You're right! You win!

-------- Computer vs Computer ------
Player 1's turn to guess.
You guessed 73.
Your guess is too high.
Player 2's turn to guess.
You guessed 27.
Your guess is too low.
Player 1's turn to guess.
You guessed 99.
Your guess is too high.
Player 2's turn to guess.
You guessed 26.
Your guess is too low.
Player 1's turn to guess.
You guessed 89.
Your guess is too high.
Player 2's turn to guess.
You guessed 36.
Your guess is too low.
Player 1's turn to guess.
You guessed 46.
Your guess is too high.
Player 2's turn to guess.
You guessed 52.
Your guess is too high.
Player 1's turn to guess.
You guessed 77.
Your guess is too high.
Player 2's turn to guess.
You guessed 19.
Your guess is too low.
Player 1's turn to guess.
You guessed 81.
Your guess is too high.
Player 2's turn to guess.
You guessed 43.
Your guess is too low.
Player 1's turn to guess.
You guessed 64.
Your guess is too high.
Player 2's turn to guess.
You guessed 39.
Your guess is too low.
Player 1's turn to guess.
You guessed 9.
Your guess is too low.
Player 2's turn to guess.
You guessed 68.
Your guess is too high.
Player 1's turn to guess.
You guessed 44.
Your guess is too low.
Player 2's turn to guess.
You guessed 99.
Your guess is too high.
Player 1's turn to guess.
You guessed 18.
Your guess is too low.
Player 2's turn to guess.
You guessed 38.
Your guess is too low.
Player 1's turn to guess.
You guessed 83.
Your guess is too high.
Player 2's turn to guess.
You guessed 98.
Your guess is too high.
Player 1's turn to guess.
You guessed 18.
Your guess is too low.
Player 2's turn to guess.
You guessed 25.
Your guess is too low.
Player 1's turn to guess.
You guessed 12.
Your guess is too low.
Player 2's turn to guess.
You guessed 35.
Your guess is too low.
Player 1's turn to guess.
You guessed 79.
Your guess is too high.
Player 2's turn to guess.
You guessed 92.
Your guess is too high.
Player 1's turn to guess.
You guessed 9.
Your guess is too low.
Player 2's turn to guess.
You guessed 14.
Your guess is too low.
Player 1's turn to guess.
You guessed 27.
Your guess is too low.
Player 2's turn to guess.
You guessed 64.
Your guess is too high.
Player 1's turn to guess.
You guessed 84.
Your guess is too high.
Player 2's turn to guess.
You guessed 37.
Your guess is too low.
Player 1's turn to guess.
You guessed 98.
Your guess is too high.
Player 2's turn to guess.
You guessed 80.
Your guess is too high.
Player 1's turn to guess.
You guessed 54.
Your guess is too high.
Player 2's turn to guess.
You guessed 73.
Your guess is too high.
Player 1's turn to guess.
You guessed 66.
Your guess is too high.
Player 2's turn to guess.
You guessed 92.
Your guess is too high.
Player 1's turn to guess.
You guessed 40.
Your guess is too low.
Player 2's turn to guess.
You guessed 30.
Your guess is too low.
Player 1's turn to guess.
You guessed 59.
Your guess is too high.
Player 2's turn to guess.
You guessed 15.
Your guess is too low.
Player 1's turn to guess.
You guessed 2.
Your guess is too low.
Player 2's turn to guess.
You guessed 67.
Your guess is too high.
Player 1's turn to guess.
You guessed 32.
Your guess is too low.
Player 2's turn to guess.
You guessed 46.
Your guess is too high.
Player 1's turn to guess.
You guessed 23.
Your guess is too low.
Player 2's turn to guess.
You guessed 24.
Your guess is too low.
Player 1's turn to guess.
You guessed 60.
Your guess is too high.
Player 2's turn to guess.
You guessed 51.
Your guess is too high.
Player 1's turn to guess.
You guessed 29.
Your guess is too low.
Player 2's turn to guess.
You guessed 14.
Your guess is too low.
Player 1's turn to guess.
You guessed 50.
Your guess is too high.
Player 2's turn to guess.
You guessed 42.
Your guess is too low.
Player 1's turn to guess.
You guessed 95.
Your guess is too high.
Player 2's turn to guess.
You guessed 30.
Your guess is too low.
Player 1's turn to guess.
You guessed 27.
Your guess is too low.
Player 2's turn to guess.
You guessed 96.
Your guess is too high.
Player 1's turn to guess.
You guessed 25.
Your guess is too low.
Player 2's turn to guess.
You guessed 71.
Your guess is too high.
Player 1's turn to guess.
You guessed 40.
Your guess is too low.
Player 2's turn to guess.
You guessed 44.
Your guess is too low.
Player 1's turn to guess.
You guessed 4.
Your guess is too low.
Player 2's turn to guess.
You guessed 4.
Your guess is too low.
Player 1's turn to guess.
You guessed 81.
Your guess is too high.
Player 2's turn to guess.
You guessed 56.
Your guess is too high.
Player 1's turn to guess.
You guessed 85.
Your guess is too high.
Player 2's turn to guess.
You guessed 24.
Your guess is too low.
Player 1's turn to guess.
You guessed 7.
Your guess is too low.
Player 2's turn to guess.
You guessed 64.
Your guess is too high.
Player 1's turn to guess.
You guessed 16.
Your guess is too low.
Player 2's turn to guess.
You guessed 93.
Your guess is too high.
Player 1's turn to guess.
You guessed 92.
Your guess is too high.
Player 2's turn to guess.
You guessed 11.
Your guess is too low.
Player 1's turn to guess.
You guessed 41.
Your guess is too low.
Player 2's turn to guess.
You guessed 76.
Your guess is too high.
Player 1's turn to guess.
You guessed 11.
Your guess is too low.
Player 2's turn to guess.
You guessed 34.
Your guess is too low.
Player 1's turn to guess.
You guessed 13.
Your guess is too low.
Player 2's turn to guess.
You guessed 26.
Your guess is too low.
Player 1's turn to guess.
You guessed 20.
Your guess is too low.
Player 2's turn to guess.
You guessed 51.
Your guess is too high.
Player 1's turn to guess.
You guessed 69.
Your guess is too high.
Player 2's turn to guess.
You guessed 90.
Your guess is too high.
Player 1's turn to guess.
You guessed 34.
Your guess is too low.
Player 2's turn to guess.
You guessed 28.
Your guess is too low.
Player 1's turn to guess.
You guessed 83.
Your guess is too high.
Player 2's turn to guess.
You guessed 81.
Your guess is too high.
Player 1's turn to guess.
You guessed 62.
Your guess is too high.
Player 2's turn to guess.
You guessed 12.
Your guess is too low.
Player 1's turn to guess.
You guessed 59.
Your guess is too high.
Player 2's turn to guess.
You guessed 1.
Your guess is too low.
Player 1's turn to guess.
You guessed 45.
You're right! You win!