html - Value of radio button is as NULL and ON -


i'm trying retrieve value of radio button in servlet im getting on ones have selected , null ones have not selected. i'm not getting values. please me out.

the servlet 

for(int i=0;i<itemnode.getlength();i++){             ans[i] = request.getparameter(integer.tostring(i));             system.out.println(ans[i]);         }

the html page : 

<input type="radio" name="1" value="1" style="float: left;"> <input type="radio" name="1" value="2" style="float: left;"> <input type="radio" name="1" value="3" style="float: left;"> <input type="radio" name="1" value="4" style="float: left;">  <input type="radio" name="2" value="1" style="float: left;"> <input type="radio" name="2" value="2" style="float: left;"> <input type="radio" name="2" value="3" style="float: left;"> <input type="radio" name="2" value="4" style="float: left;">

the output @ console: 

null on

null ones have not selected , on ones have selected


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