ReadString

import java.util.InputMismatchException;
import java.util.Scanner;

public class ReadString {

    public static void main(String[] args) {

        String str;
        Scanner input = new Scanner(System.in);

        System.out.print("Enter strings, enter DONE when finished: ");
        str = input.nextLine();

        do {
            try {
                if ((str.length() > 20)) {
                    throw new StringTooLongException();
                }
                System.out.print("Enter strings, enter DONE when finished: ");
                str = input.nextLine();
            } catch (StringTooLongException e) {
                // Delete the line below before submitting, it is just a test.
                System.out.println("If you see this, then exception is caught, thus this " +
                        "catch block works.");
                System.out.println(e.getMessage());
                return;
            }
        } while(!str.equalsIgnoreCase("done"));
    }
}