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Thread: Passing a value to another class

  1. #1
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    Default 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");
            }
        }
    }


  2. #2
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    Default Re: Passing a value to another class

    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.

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