关于在MAP里面做合计的问题

Question

直接上代码：  ResList = DB.select(); //SELECT方法，检索之后返回一个List
                int rowSize = ResList .size();                if (rowSize != 0) {
                        for (int i = 0; i < 20; i++) {  //固定只输出20行，不够补空行
                            dataTmp = new HashMap<String, String>();
                            if(i < rowSize){
                                dataTmp.put("KENSU1",
                                    sqlRes_List.get(i).get("KENSU1").toString());
                                dataTmp.put("GAK1", sqlRes_List.get(i).get("GAK1")
                                    .toString());
                                dataTmp.put("KENSU2",
                                    sqlRes_List.get(i).get("KENSU2").toString());
                                dataTmp.put("GAK2", sqlRes_List.get(i).get("GAK2")
                                    .toString());
                                dataTmp.put("KENSU3",
                                    sqlRes_List.get(i).get("KENSU3").toString());
                                dataTmp.put("GAK3", sqlRes_List.get(i).get("GAK3")
                                    .toString());
                                dataTmp.put("KENSU4",
                                    sqlRes_List.get(i).get("KENSU4").toString());
                                dataTmp.put("GAK4", sqlRes_List.get(i).get("GAK4")
                                    .toString());
                            }
                            else if (i > rowSize){
                                dataTmp.put("KENSU1","");
                                dataTmp.put("GAK1", "");
                                dataTmp.put("KENSU2","");
                                dataTmp.put("GAK2", "");
                                dataTmp.put("KENSU3","");
                                dataTmp.put("GAK3", "");
                                dataTmp.put("KENSU4","");
                                dataTmp.put("GAK4", "");
                            }现在我想在这个List里面做一下合计，5条算一次合计，然后就按照5条一合计，5条一合计这样的格式重新再放到一个List里面。求高手指教怎么实现。

Answer 1

5条一合计？没看太明白。。if(i%5==0){
  // do something..?
}