>loop. You can however reuse the same enumeration variable like this:
>Enumeration enum = request.getParameterNames();
><snip>
>
>while(enum.hasMoreElements()) {
<snip>
>}
>enum = request.getParameterNames();
Just to pick a nit, you are not reusing the same enumeration, rather
you setting the same variable ("enum") to contain the same value
("request.getParameterNames()"). While effectively the same, these are different, and
I have long wished that one could "rewind" an enumeration:
while(enum.hasMoreElements()) {
<snip>
}
enum.rewindToBeginning(); // a long winded method name
so I wouldn't have to reset the value of the enumeration...
Sorry, you just hit a sore spot of mine,
Lance
-----Original Message-----
From: Chris Pratt <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Tuesday, September 21, 1999 8:30 PM
Subject: Re: Enumeration for http parameters
>An enumeration allows you to run through a collection of objects. Once
>you've reached the end, it does not go back to the top. If it did, you
>wouldn't know when you reached the end and you'd have yourself an endless
>loop. You can however reuse the same enumeration variable like this:
>
>String name;
>String value;
>Enumeration enum = request.getParameterNames();
>Hashtable hash = new Hashtable();
>
><snip>
>
>while(enum.hasMoreElements()) {
> name = (String)enum.nextElement();
> value = request.getParameter(name);
> hash.put(name, value);
> System.out.println(hash.get(name));
>}
>enum = request.getParameterNames();
>while(enum.hasMoreElements()) {
> name = (String)enum.nextElement();
> value = (String)hash.get(name);
> System.out.println(value);
> msg.println(name + ": " + value);
>}
>
> (*Chris*)
>
>----- Original Message -----
>From: Message UK <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Tuesday, September 21, 1999 5:34 AM
>Subject: Enumeration for http parameters
>
>
>> Hello all. I have an email servlet which processes a form. I use an
>> Enumeration to get the parameter names, the values of which I then put
>into
>> a hashtable (don't ask). When I get the values out again to output, I find
>I
>> have to use a second Enumeration to get the parameter names. If I don't,
>> nothing is retrieved from my hastable. Does the Enumeration object "empty"
>> as the elements in it are retrieved? Thanks so much.
>>
>> Enumeration enum = request.getParameterNames();
>> Enumeration enum2 = request.getParameterNames();
>>
>>
>> file://we'll store the submitted parameters here
>> Hashtable hash = new Hashtable();
>>
>> <snip>
>>
>> while(enum.hasMoreElements())
>> {
>>
>> String name = (String)enum.nextElement();
>> String value = request.getParameter(name);
>>
>> hash.put(name, value);
>>
>> System.out.println(hash.get(name));
>>
>> }
>>
>>
>> <snip>
>>
>> while (enum2.hasMoreElements())
>> {
>> String name = (String)enum2.nextElement();
>> System.out.println((String)hash.get(name));
>>
>> msg.println(name + ": " + (String)hash.get(name));
>> }
>>
>>
>>
>> D Lampon
>>
>> ______________________________________________________
>> Get Your Private, Free Email at http://www.hotmail.com
>>
>>
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