Java StringTokenizer，空空标记

我正在尝试将一个字符串拆分为 29 个标记...... stringtokenizer 不会返回空标记。我尝试过 string.split，但我相信我做错了什么：

String [] strings = line.split(",", 29);

示例输入：

10150,15:58,23:58,16:00,00:00,15:55,23:55,15:58,00:01,16:03,23:58,,,,,16:00,23:22,15:54,00:03,15:59,23:56,16:05,23:59,15:55,00:01,,,,
10155,,,,,,,,,,,07:30,13:27,07:25,13:45,,,,,,,,,,,07:13,14:37,08:01,15:23
10160,10:00,16:02,09:55,16:03,10:06,15:58,09:48,16:07,09:55,16:00,,,,,09:49,15:38,10:02,16:04,10:00,16:00,09:58,16:01,09:57,15:58,,,,

如果您希望保留尾随的空字符串，但又不想给出最大值的幻数，请使用负限制：

line.split(",", -1)

If line.equals("a,,c"), then line.split(",", -1)[1].isEmpty();它不是null。这是因为当","是分隔符，那么",,"两个分隔符之间有一个空字符串，而不是null.

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Example:

使用上面的解释，考虑以下示例：",,"

尽管你可能期望",", null, and ",".

实际结果是",", "" and ","

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If you want null instead of empty strings in the array returned by split, then you'd have to manually scan the array and replace them with null. I'm not sure why s == null is better than s.isEmpty(), though.

See also

• Java String.indexOf和空字符串