arraylist - java.lang.IndexOutOfBoundsException: Index: 4, Size: 4 -

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how can fix outofboundsexception?

here code using:

 resultset rstagcheck = stmt.executequery(      "select parking.xkrprmt.xkrprmt_pidm, parking.xkrprmt.xkrprmt_status, parking.xkrprmt.xkrprmt_expire_yr, parking.xkrprmt.xkrprmt_tag parking.xkrprmt xkrprmt_pidm ='" + bannerid + "'");  while (rstagcheck.next()){      string tagnum = rstagcheck.getstring("xkrprmt_tag");      arraylist<string> mytag = new arraylist<string>();       (int = 0; < tagnum.length(); i++){          mytag.add(tagnum);          mytag.get(i + i);

i kinda know why getting error, not sure how remedy problem.

what expect mytag.get(i + i) do?

the first time through loop, "i" 0 , add 1 element. there won't element 1, call throw exception. see wrote, it'll fail on second iteration, not first, poor @giu noted in now-deleted answer. still, it's weird , don't know you're trying accomplish calling .get() , not looking @ return value.

you have explain you're trying do, because doesn't make sense written. did exception in question title really come code, or did edit part of out when posting?

edit — whoops totally saw "i+i" "i+1". still makes no sense me however.


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