package sep_hw;

import java.util.Scanner;

public class RandomGenerator {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.print("Please, enter the size of your random-string: ");
        int stringLenght = scan.nextInt();
        scan.close();
        System.out.println("Your string is: " + randomString(stringLenght));
    }

    public static String randomString(int stringLength) {
        String charNumberMix = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890";
        StringBuilder sb = new StringBuilder(stringLength);

        if (stringLength != 0 && stringLength > 0) {
            for (int i = 0; i < stringLength; i++) {
                int index = (int) (charNumberMix.length() * Math.random());

                sb.append(charNumberMix.charAt(index));
            }
            return sb.toString();
        } else
            System.err.print("Not valid number");
        return null;

    }


}