Thread: Passing a value to another class

To summarise I am required to make a game, that a user has to guess the secret number. The secret number is generated by a random number.

Anyway I'm having a problem passing the random number to another class. Currently I am only passing it to the main class for testing purposes.

With this code the random number passes a zero

import java.util.Scanner;
import java.util.Random;
 
public class GameOptions {
 
    Scanner scan = new Scanner(System.in);
    public int SecretNumber;
    public int RandomNumber;
 
    public void ShowSecretNumber() {
 
        do {
            System.out.println("Enter a secret number between 1 and 10");
            SecretNumber = scan.nextInt();
        } while (SecretNumber < 1 || SecretNumber > 10);
 
    }
 
    public void SetRandomNumber (int RandomNumber)
    {
        Random number = new Random();
        RandomNumber = number.nextInt(10) + 1;
    }
 
    public int getRandomNumber() {
        return RandomNumber;
    }
}

And with this it passes whatever the value I set it to. Currently a 5.

import java.util.Scanner;
import java.util.Random;
 
public class GameOptions {
 
    Scanner scan = new Scanner(System.in);
    public int SecretNumber;
    public int RandomNumber;
 
    public void ShowSecretNumber() {
 
        do {
            System.out.println("Enter a secret number between 1 and 10");
            SecretNumber = scan.nextInt();
        } while (SecretNumber < 1 || SecretNumber > 10);
 
    }
 
    public void SetRandomNumber (int RandomNumber)
    {
        Random number = new Random();
        RandomNumber = number.nextInt(10) + 1;
    }
 
    public int getRandomNumber() {
        return RandomNumber=5;
    }
}

I can understand that RandomNumber=5 sets the value to 5 but why is this ignoring what the "SetRandomNumber" method sets the value to.

Any ideas??
Thanks in advanced


EDIT: Just adding the main class in case someone needs to see the output..

 
import java.util.Scanner;
 
public class GameInterface {
 
    Scanner scan = new Scanner(System.in);
    public int lives;
 
    public static void main(String[] args) {
 
        //******//
        GameOptions number = new GameOptions();
        //******//
 
        int mode = 0;
        int choice;
        int lives;
        int secretnumber;
 
        Scanner scan = new Scanner(System.in);
        Statistics statistics = new Statistics();
        GameOptions secretNumber = new GameOptions();
        NumberGuessingGame game = new NumberGuessingGame();
 
        do {
            System.out.println("Select the mode of play: 1 Normal; 2 Testing");
            mode = scan.nextInt();
        } while (mode != 1 && mode != 2);
 
 
        do {
            System.out.println("*****MAIN MENU*****");
            System.out.println("1. Start a new game");
            System.out.println("2. Show the Stats");
            System.out.println("3. Exit");
            choice = scan.nextInt();
        } while (choice != 1 && choice != 2 && choice != 3);
 
        switch (choice) {
            case 1:
                System.out.println("Enter number of lives");
                lives = scan.nextInt();
 
                System.out.println("Random Number = " + number.getRandomNumber());
 
                if (mode == 2) {
                    secretNumber.ShowSecretNumber();
                }
                game.Play();
                break;
            case 2:
                statistics.ShowStatistics();
                break;
            case 3:
                System.exit(0);
                break;
            default:
                System.out.println("Choose Again");
        }
    }
}

From what i can see, no need for parameter for your setRandomNumber method:

public void SetRandomNumber()
    {
        Random number = new Random();
        RandomNumber = number.nextInt(10) + 1;
    }

You're returned a 0 because you dont call setRandomNumber() in your main method, so it returns a default int value of 0 because it hasn't been initialised.

You are returned 5 because you're assigning the value 5 each time you request the number, so it's always going to be 5.

Call setRandomNumber in main before trying to call the GET method.