TP03E06ClassHelper

package punto;
import java.util.Scanner;

class Helper {
    public static Scanner scanner = new Scanner(System.in);

    public static int forceReadPositiveInteger(String msg)
    {
        int ret = 0;
        while(true)
        {
            try
            {
                System.out.println(msg);
                while((ret = Integer.parseInt(scanner.next())) < 1) System.out.println("El número a cargar debe ser positivo.\n"+msg);
                return ret;
            }catch (Exception e) {
                System.out.println("Error en la carga.");
            }
        }
    }

    public static int forceReadRangeInteger(String msg, int a, int b)
    {
        int ret = 0;
        while(true)
        {
            try
            {
                System.out.println(msg);
                while((ret = Integer.parseInt(scanner.next())) < a || ret > b) System.out.println("Opción fuera de rango.\n"+msg);
                return ret;
            }catch (Exception e) {
                System.out.println("Error en la carga.");
            }
        }
    }


    public static char forceReadAnLetter(String msg)
    {
        char ret = '\0';
        while(true)
        {
            try
            {
                String aux;
                System.out.println(msg);
                while((aux = scanner.next()).length() > 1 || !Character.isAlphabetic((ret = aux.charAt(0))) ) System.out.println("Se debe cargar una sola letra.\n" + msg);
                return ret;
            }catch (Exception e) {
                System.out.println("Error en la carga.");
            }
        }
    }


    public static int getRandomIntBetweenRange(double min, double max){
        int x = (int) ((int)(Math.random()*((max-min)+1))+min);
        return x;
    }
    public static char generateRandomLetter()
    {
        return ((getRandomIntBetweenRange(0,17)% 2 == 0) ?  (char) (getRandomIntBetweenRange(0, 25)+97): (char) (getRandomIntBetweenRange(0, 25)+65));
    }


    public static boolean isVowel(char xCh)
    {
        xCh = Character.toLowerCase(xCh);
        return xCh == 'a' || xCh == 'e' || xCh == 'i' || xCh == 'o' || xCh == 'u';
    }

    public static String generateRandomString()
    {
        String ret = "";
        for(int i = 0; i < getRandomIntBetweenRange(5, 20); i++)
        {
            ret+=generateRandomLetter();
        }
        return ret;
    }
    public static boolean continueInput(String msg)
    {
        char x = '\0';
        while(true)
        {
            try
            {
                System.out.println(msg);
                x =Character.toUpperCase(scanner.next().charAt(0));
                if(x == 'S' || x == 'N') return x == 'S';
                System.out.println("Opción inválida, reintente.");
            }catch (Exception e) {
                System.out.println("Opción inválida, reintente.");
            }
        }
    }

    public static boolean isRandom()
    {
        char x = '\0';
        while(true)
        {
            try
            {
                System.out.println("¿Generar valores aleatorios? (S/N)");
                x =Character.toUpperCase(scanner.next().charAt(0));
                if(x == 'S' || x == 'N') return x == 'S';
                System.out.println("Opción inválida, reintente.");
            }catch (Exception e) {
                System.out.println("Opción inválida, reintente.");
            }
        }
    }
}