Util(Function)class

-------------------------------Function.class--------------------------------

public class Function {
    /*/...........................Email_validation.......................*/
    public boolean emailValidator(String email)
    {
        Pattern pattern;
        Matcher matcher;
        final String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
        pattern = Pattern.compile(EMAIL_PATTERN);
        matcher = pattern.matcher(email);
        return matcher.matches();
    }


    /*/...........................Password_validation.......................*/
    public static boolean isValidPassword(final String password) {

        Pattern pattern;
        Matcher matcher;
        final String PASSWORD_PATTERN =
                "^(?=.*[0-9])(?=.*[A-Z])(?=.*[@#$%^&+=!])(?=\\S+$).{4,}$";
        pattern = Pattern.compile(PASSWORD_PATTERN);
        matcher = pattern.matcher(password);

        return matcher.matches();

    }


    /*/...........................Mobile_number_validation.......................*/
    private boolean isValidMobile(String phone, Context context) {
        boolean check=false;
        if(!Pattern.matches("[a-zA-Z]+", phone)) {
            if(phone.length() < 6 || phone.length() > 13) {
                // if(phone.length() != 10) {
                check = false;
                Toast.makeText(context, "Not Valid Number", Toast.LENGTH_SHORT).show();
            } else {
                check = true;
            }
        } else {
            check=false;
        }
        return check;
    }


    /*/...........................Snack_bar_show.......................*/
    public static void Snackbar(Context context, View view, String s) {
        Snackbar snack = Snackbar.make(view, s, Snackbar.LENGTH_LONG);
        View sbview = snack.getView();
        TextView textView = sbview.findViewById(android.support.design.R.id.snackbar_text);
        sbview.setBackgroundColor(ContextCompat.getColor(context, R.color.colorPrimary));
        textView.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
        snack.show();
    }


/*.....................Six_random_digit_genrate............................*/
    public static int sixDigitRandomNum() {
        int longtime = (int) System.currentTimeMillis();
        String number = String.valueOf(longtime).substring(4);
        int bookingNumber = Integer.parseInt(number);
       /* Random random = new Random();
        int num = random.nextInt(1) + 5;*/
        return bookingNumber;
    }
    /*.....................Current_date...................................*/

    public static String currentDateBooking() {
        Calendar c = Calendar.getInstance();
        SimpleDateFormat df1 = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
        return df1.format(c.getTime());
    }
    /*.....................Current_date...................................*/

    public static String currentTimeBooking() {
        Calendar c = Calendar.getInstance();
        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss", Locale.getDefault());
        return df.format(c.getTime());
    }

}