分页计算逻辑

int size = list.size();
            int count = 0 ;
            if(size%pageSize == 0){
                count = size/pageSize ;
            }else{
                count = size/pageSize + 1 ;
            }
            countDownLatch = new CountDownLatch(count);
            for (int i = 0; i < count; i++) {
                int start = 0 ;
                int end = 0 ;
                if(i == count-1){
                    start = i*pageSize ;
                    end = size ;
                }else{
                    start = i*pageSize ;
                    end = (i+1)*pageSize ;
                }
                List segmentList = list.subList(start,end);
              //  service.execute(new SaveDataThread(countDownLatch,aCountryMapper,segmentList));
                service.execute(new SaveDataThread(segmentList));

            }