JAVA, Board game. Random dice numbers not random

Question

I am new to Java and writing code. I want to program a simple board game. But if I roll the dice, I get the same number every roll. What did I do wrong?

I have a class to create a random between 1 and 6:

public class Dice {
    public int throwDice() {
        Random random = new Random();
        int dice = random.nextInt(6) + 1;
        return dice;
    }
}

And the main class:

public class BoardGame{

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String r;
        Dice dice = new Dice();
        int roll = dice.throwDice();
        int position = 0;
        int finish = 40;

        while (finish >= position) {
            do {
                System.out.print("Roll the dice (r): ");
                r = input.nextLine();
            } while (!r.toLowerCase().equals("r"));

            if (r.toLowerCase().equals("r")) {
                System.out.println("You have rolled " + roll + ".");
                position += roll;
                System.out.println("You are now on square " + position + ".");
            }

        }
        System.out.println("You won!");
        input.close();
    }

}

Thank you!

Answer 1

The code that does get a random result:

int roll = dice.throwDice();

runs exactly once. You call the throw method once. You store the result, not a "pointer" to a function that would get invoked repeatedly whenever roll gets used somewhere.

So you should put that line:

roll = dice.throwDice();
System.out.println("You have rolled " + roll + ".");

right in front of the place where you expect another roll of the dice!