Handling fractions

[Fasih]

Ok so I'm making a fraction program for class, but I can't seem to make the program accept a whole number because im finding fract.indexOf ('/'); for the actual fractions so i can work around the "/" and get the numerator and denominator. But because of that, if i enter a whole number, I get a

CODE:

java.lang.StringIndexOutOfBoundsException: String index out of range: -1

error.

Note I am reading the fractions as a String

Heres the read function in my class:

CODE:

public void read (String fract)     {                pos = fract.indexOf ('/');         numerS = fract.substring (0, pos);         denomS = fract.substring (pos + 1);                 boolean check = false;         while (!check)         {             try             {                 numer = Integer.parseInt (numerS);                 denom = Integer.parseInt (denomS);                 check = true;             }             catch (NumberFormatException x)             {                 //System.out.print ("Invalid Input, try again");                 read (fract);             }         }     }

Can someone tell me what to add?

Also, how do I force the user to enter another number if it catches the exception. I am doing a GUI and this Fraction class is separate from my GUI class.

[Insectoid]

Just check if fract.indexof ('/') is -1. If it is, there's no fraction. If it's greater than 0, there's a fraction.

[Fasih]

But I want to allow whole numbers.

Like if a user inputs a 8 into the textfield then that 8 would be the numerator and the denominator would be 1

[Insectoid]

And if there's no '/' (indexof returns -1) then you know it's a whole number, and you can account for it.

[Fasih]

Ooh ok it works now!

Also for the other question I had in my post, if it catches the exception, how can I make the user re-enter the value. Its in a GUI which is in another class, and from the GUI I'm calling this class.