Project: Number Guessing Game

👋 Let’s get started!

Let’s build a real game! 🎯 The computer picks a secret number from 1 to 100, and the player guesses until they get it — with “too high” and “too low” hints.

🪜 Step by step

import java.util.Scanner;

Scanner in = new Scanner(System.in);
int guess = in.nextInt();

import java.util.Random;

Random rand = new Random();
int secret = rand.nextInt(100) + 1;

while (guess != secret) {
    // ask again and give a hint
}

🧪 Try it!

Read the code, guess what it prints, then press 👀 Show output.

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

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int secret = new Random().nextInt(100) + 1;
        int guess = 0;
        int tries = 0;
        System.out.println("I picked a number from 1 to 100! 🎯");
        while (guess != secret) {
            System.out.print("Your guess: ");
            guess = in.nextInt();
            tries++;
            if (guess < secret) {
                System.out.println("Too low! ⬆️");
            } else if (guess > secret) {
                System.out.println("Too high! ⬇️");
            }
        }
        System.out.println("You got it in " + tries + " tries! 🏆");
    }
}

if (guess < secret) {
    System.out.println("Too low!");
} else if (guess > secret) {
    System.out.println("Too high!");
} else {
    System.out.println("Correct!");
}

📖 Key words

Tap a card to flip it over!

🏆 Challenge

How to run it: ask a grown-up or teacher to install the free Java JDK, or use an online Java editor your school approves. Then remix it: add a limit of 7 tries and print “Out of tries!” if the player doesn’t win.

int maxTries = 7;
while (guess != secret && tries < maxTries) {
    // ...
}
if (guess != secret) {
    System.out.println("Out of tries! It was " + secret);
}