Simple Coin Toss using random class in Java. The do while loop doesn't seem to generate random results

Question

I'm having issues generating the random number each time I run through the do-while loop in main. When I remove the do - while statement the if statement works fine and seems to generate a random result each time but when it is repeated in the loop it seems to just repeat the initial result.

Here is my code:

import java.util.Random;

public class CoinToss {
    private enum Coin {Heads, Tails};

    Random randomNum = new Random();
    private int result = randomNum.nextInt(2);
    private int heads = 0;
    private int tails = 1;
    Coin coinFlip;

    public void flip() {
        if (result == 0) {
            coinFlip = Coin.Heads;
            System.out.println("You flipped Heads!");
        } else {
            coinFlip = Coin.Tails;
            System.out.println("You flipped Tails!");
        }
    }
}

And my method main where I seem to be having issues:

import java.util.Scanner;

public class TossGame {
    public static void main(String[] args) {
        CoinToss test = new CoinToss();
        int choice;

        System.out.println("Welcome to the coin toss game!");
        do {
            System.out.print("Enter 1 to toss coin or enter 0 to quit: ");
            Scanner input = new Scanner(System.in);
            choice = input.nextInt();

            if (choice == 1) {
                test.flip();
            } else if (choice > 1) {
                System.out.println("Invalid entry - please enter 1 or 0: ");
                choice = input.nextInt();
            }
        } while (choice != 0);
    }
}

Answer 1

You need to put result inside of flip() method, so it is randomized each call.

private int result;
private int heads = 0;
private int tails = 1;
Coin coinFlip;

public void flip(){
    result = randomNum.nextInt(2)
    if(result == 0){
        coinFlip = Coin.Heads;
        System.out.println("You flipped Heads!");
    }else{
        coinFlip = Coin.Tails;
        System.out.println("You flipped Tails!");
    }
  }
}