JAVA Case Study #4: Number Guessing Game

This case study involves a random number generator -- but in this case we will be using a "Math" method for the random number.  We will work through it in steps:

CASE STUDY #4:  A Number Guessing Game -- Building a Program Step By Step

Step One: Let's try a different method for finding a random number -- this time from 1 to 1000.

import java.util.Scanner;

public class NumberGuessingGame {
    public static void main(String[] args)
    {
        int secretNumber;
        secretNumber = (int) (Math.random() * 999 + 1);
        System.out.println("Secret number is " + secretNumber); // to be removed later
        Scanner keyboard = new Scanner(System.in);
        int guess;
              
        do {
            System.out.print("Enter a guess: ");
            guess = keyboard.nextInt();
            System.out.println("Your guess is " + guess);
            if(guess == secretNumber)
                        {
                            System.out.println("Your guess is correct! Congratulations!");
                        }
            if (guess < secretNumber)
                        {
                            System.out.println("Your guess is smaller than the secret number.");
                        }
            if (guess > secretNumber)
                        {
                            System.out.println("Your guess is larger than the secret number.");
                        }
        } while (guess != secretNumber);
    }
}

Suggestions for Continuing to Upgrade Your Code

• Add comments and labels [obviously]
• Create a little title text graphic to display at the beginning of your program.
• Display "Guess #" in front of [or behind] each "Enter a guess" prompt.
• Limit the number of guesses a user gets -- and you might even have it display something like "Guess 3 of 10".