I got NumberFormatException in the below code , Please analyze that need do favor

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  • Pradhi11
    New Member
    • Jul 2014
    • 1
    #1

    I got NumberFormatException in the below code , Please analyze that need do favor

    Can i get the values from the same JSP page for further calculation.

    Example:
    Code:
    <html> <form>
Enter ID:<input type="text" name="id"> <%
    String id=request.getParameter("id");
     int no=Integer.ParseInt(id);
:%> </form> </html>
    For the above code I got NumberFormatExc eption if it is possible or any other way to achive this in same jsp file.

    Thanks in advance
    Last edited by Rabbit; Jul 5 '14, 05:10 AM. Reason: Please use [code] and [/code] tags when posting code or formatted data.
    Tags: None
    • rajujrk
      New Member
      • Aug 2008
      • 107
      #2
      Use the below Code

      Code:
       <html> <form>
    Enter ID:<input type="text" name="id"> <%
       [B] String id=(request.getParameter("id")!=null)?request.getParameter("id"):"0";[/B]
         int no=Integer.ParseInt(id);
    :%> </form> </html>

      Thanks
      Raju

        Comment

        • chaarmann
          Recognized Expert Contributor
          • Nov 2007
          • 785
          #3
          Integer.ParseIn t(id) throws a NumberFormatExc eption if the parameter given does not contain a number. So the code given by Raju does not fix this problem.
          For example:

          id="Hello";
          Integer.ParseIn t(id);

          So you need to surround your code with a try - catch statement, and in case no number is given you need to do some error handling (e.g. popping up a box with "Please enter a valid number" and focussing on the input field)

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