ConcurrentHashMap中的条目数是否有上限？

Question

我正在努力阅读大约200万条目的文件。并非所有都是有效的行，但这是上限。我正在使用Map来存储文件中的键值对。然而，我发现最后一个术语是在1932513行。我正在用Java编写eclipse，然后继续在eclipse.ini中提升Xmx参数。这并没有解决问题。这是我正在使用的代码：

BufferedReader bufferedRead = new BufferedReader(inputStream);
        String data;
        try {
            while((data = bufferedRead.readLine()) != null) {
                String[] meterReadings = data.split(";");
                if("Date".equals(meterReadings[0])) continue;
/*
 *  Creating the key object using concatenation of date-time        
 */
                if(newApp.isEmpty(meterReadings)) continue;
                List<Object> valueList = new ArrayList<Object>();
                String[] subDate = meterReadings[0].split("/");
                StringBuffer dateTime = new StringBuffer();
                for(String s : subDate) {
                    dateTime.append(s + ":");
                }

                dateTime.append(meterReadings[1]);
                for(int i=2; i < meterReadings.length -1; ++i) {            
                    valueList.add(meterReadings[i]);
                }
                newApp.textMap.put(dateTime.toString(), valueList);
            }
        } catch (IOException e) {
            log.error("Unable to read from file: ", App.DATA_DIR + App.FILENAME);
            e.printStackTrace();
        }
/*
 *  Checking to see if Map has been created      
 */
        System.out.println("*****************************************");
        Set<String> newSet = newApp.textMap.keySet();
        Object[] setArray = newSet.toArray();
        System.out.println("The last term's key is : " + (String) setArray[setArray.length - 1]);
        System.out.println(newApp.textMap.size());
        log.info("The size of the reading is : ", newApp.textMap.size());
        System.out.println("*****************************************");

    }