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

public class RangeInput
{
    RangeInput (int low, int high)
    {
        this.low = low;
        this.high = high;
        in = new Scanner (System.in);
    }
    
    public int readNumber()
    {
        int number;
        while (true)
        {
            try
            {
                System.out.print("Please enter a number between " + 
                    low + " and " + high + " > ");
                number = in.nextInt();
                if ((number < low) || (number > high))
                {
                    throw (new NumberRangeException());
                }
                return number;
            }
            catch (NumberRangeException exc)
            {
                System.out.println("Error - the number is either too small or too big.");
            }
            catch (InputMismatchException exc)
            {
                in.nextLine();      // must flush the input buffer
                // System.out.println(exc);
                System.out.println("Sorry - that must be an integer.  Please try again.");
            }
        }
    }
    
    private int low;
    private int high;
    private Scanner in;

}