Radio button return null value

i am creating radio buttons using for loop.
i try to get radio button values using for loop i get only null values plz help me…
my jsp coding is
<form method=“post” action=“evaluation” >
<% int i,k=0;

<tr><td colspan=“2”><%=++k %>  <%=question.get(i) %> <br/></td></tr>


<td style=“padding-left:10em”>a)<input type=radio name=“group+<%=i%>+” value=“<%= a.get(i) %>” /></center></td>
<td style=“padding-right:5em”>b)<input type=radio name=“group+<%=i%>+” value=“<%= b.get(i) %>”> </td> </tr>
<td style=“padding-left:10em”>c)<input type=radio name=“group+<%=i%>+” value=“<%= c.get(i) %>”></td>
<td>d)<input type=radio name=“group+<%=i%>+” value=“<%= d.get(i) %>”> <br/><br/></td>



<input type=“submit” name=“submit” value=“submit” /></center>
and my servlet coding is
String userans=new String[10];

for(int j=0;j<10;j++){
in above coding only return null values pls anyone help me…

What language is that? This needs to be moved to one of the programming forums, but I don’t recognize the code.