java - how to access collection returned by jpql from ejb in managed bean -

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i have app need fire jpql query sum() , func(year,...) functions, means 2 fields fetched , stored collection , collection returned managed bean. question how use collection retrieve each value. below session bean , managed bean code:

    public collection getscripqtyyearwise(integer scripid)  {     try     {      collection coll=em.createquery("select sum(t.tradeexecutedquantity), func('year',t.tradedatetime) tradestock t t.scripid.scripid = :scripid group func('year',t.tradedatetime) ").setparameter("scripid", scripid).getresultlist();      return coll;     }catch(exception e){return null;}  }

eg of data returned: sum(qty) year 210 2011 198 2012 need extract each of values in each record returned in followinf managed bean:

  objejb=(stockcommodityejbstateless) new initialcontext().lookup("stockcommoditytest");  collection coll=objejb.getscripqtyyearwise(scripid1); // how use collection?

coll collection of object[], can parse this:

    (object o : coll) {         object[] res = (object[]) o;         object sum = res[0];         object year = res[1];      }

if want list instead of object[] can change select this:

collection coll=em.createquery("select new list(sum(t.tradeexecutedquantity), func('year',t.tradedatetime)) tradestock t t.scripid.scripid = :scripid group func('year',t.tradedatetime) ").setparameter("scripid", scripid).getresultlist();

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