How to retrieve checkboxes values?

Question

I am using a few checkboxes
<form method="post" action="testgetPara.jsp">
<input name="termcond1" type="checkbox" value="1" id="termcond" checked>
<input name="termcond2" type="checkbox" value="2" id="termcond" >
<input name="termcond3" type="checkbox" value="3" id="termcond" >
<input type ="submit" name ="submit" value ="submit">
</form>
and hope to retrieve the "checked" values from these boxes
so i do this
<%int i = 0;
//chkno is used only to retrieve the number of checked checkboxes
String chkno[] = request.getParameterValues("chkdelbook");
               //using a while loop to retrieve the value + execute it to the database.
while (i < chkno.length)
String isbn = request.getParameter("termcond");//get the specific array item
out.println(isbn);
//increment the i counter           
++i;
%>
but it doesn't seem to be working
it return me with
An error occurred between lines: 2 and 16 in the jsp file: /testgetPara.jsp
Generated servlet error:
C:\jakarta-tomcat-4.0.3\work\localhost\Testing\testgetPara$jsp.java:69: [] can only be applied to arrays. It can't be applied to java.lang.String.
     String isbn = request.getParameter("termcond")[i];//get the specific array item
     ^
1 error
this error
may i know how to solve it?

Answer 1

but it give me a java.lang.NullPointerException
i have same id for my checkboxes, different name and
values for them
but it just doesnt work.NPE might be because tehere is no parameters named 'hobbies'
having same ID is not same as having same NAME (see the difference ID vs NAME)
if you had
<form>
<br>java<input type="checkbox" name="hobbies" value="java">
<br>haskell<input type="checkbox" name="hobbies" value="haskell">
<br>prolog<input type="checkbox" name="hobbies" value="prolog">
<input type="submit">
</form>
and it would appear something like this:
java [X]
haskell[X]
prolog[_]
[submit]
then you could probably write some code for it like this:
String[] hobbies = request.getParameterValues("hobbies");
for (int j = 0; j < hobbies.length; j++) {
%>
Your hobby is: <%= hobbies[j] %><br>
<%
}and it's output would hopefully look somewhat like this:
Your hobby is: java
Your hobby is: haskell
of course i have not tryed that code nore looked methods up from API recently, so it might have some minor bugs.