Better Random Number Generators

1. Magic 8 Ball

public class Magic8Ball {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("What is your question?");
        String question = keyboard.nextLine();

        System.out.println("The answer is: 🎱 " + generateRandomAnswer());
    }

    private static String generateRandomAnswer() {
        RandomGenerator rng = RandomGenerator.of("Xoshiro256PlusPlus");
        String[] answers = {
                "It is certain",
                "It is decidedly so",
                "Without a doubt",
                "Yes - definitely",
                "You may rely on it",
                "As I see it, yes",
                "Most likely",
                "Outlook good",
                "Yes",
                "Signs point to yes",
                "Reply hazy, try again",
                "Ask again later",
                "Better not tell you now",
                "Cannot predict now",
                "Concentrate and ask again",
                "Don't count on it",
                "My reply is no",
                "My sources say no",
                "Outlook not so good",
                "Very doubtful"
        };
        int answerIndex = rng.nextInt(answers.length);
        return answers[answerIndex];
    }

}

2. Weather Forecast

public class WeatherForecast {
    public static void main(String[] args) {
        LocalDate today = LocalDate.now();
        int nrOfDays = 7;
        for (int i = 0; i < nrOfDays; i++) {
            LocalDate date = today.plusDays(i);
            System.out.printf("%s: %.1f℃\t", date.getDayOfWeek().name(), generateRandomTemp());
        }
    }

    private static double generateRandomTemp() {
        RandomGenerator rng = RandomGenerator.of("Xoshiro256PlusPlus");
        return rng.nextDouble(-5, 20); // Between -5 and 19 degrees Celsius (inclusive)
    }
}

3. Dice Rolls

public class DiceRolls {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("How many dice do you want to roll?");
        int nrOfDice = keyboard.nextInt();
        RandomGenerator.getDefault().ints(nrOfDice, 1, 6 + 1)
                .forEach(result -> System.out.printf("🎲 Rolled a %d\n", result));
    }
}