import java.util.Scanner;

class Program {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.print("Input a string: ");
            try {
                String input = scanner.nextLine();
                SomeObject x = new SomeObject(input);
                break;
            } catch (IllegalArgumentException iae) {
                System.out.print("Try again: ");
            }
        }

        while (true) {
            // inne rzeczy do przetworzenia
        }
    }
}

class Main {
    public static void main(String args[]) {
        Program main = new Program();
        main.run();
    }
}