String.split() 如果在字符串的最后部分，则忽略定界符之间的空值
String.split() ignoring empty values inbetween delimiters if on the final part of a string
给定以下字符串：
String s ="12/15|22:58:25|B|99.502||||A|100.501|||||";
我在打电话
int len = s.split("\|").length;
反正长度是 9，而不是应该的 13。
然而，如果我以这种方式修改所述字符串：
String s ="12/15|22:58:25|B|99.502||||A|100.501|||lol||";
长度是13！
怎么会？似乎 java 进行了某种优化，这不是必需的，因为字符串的那些部分可以在其他上下文中填充...
默认情况下 split 从结果数组中删除尾随的空字符串。要关闭此机制，请使用 split(regex, limit) 和负限制，如
split("\|", -1)
更多细节：
split(regex) 内部 returns split(regex, 0) 的结果，在这个方法的 documentation 中你可以找到（强调我的）
The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array.
If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter.
If n is non-positive then the pattern will be applied as many times as possible and the array can have any length.
If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.
给定以下字符串：
String s ="12/15|22:58:25|B|99.502||||A|100.501|||||";
我在打电话
int len = s.split("\|").length;
反正长度是 9，而不是应该的 13。
然而，如果我以这种方式修改所述字符串：
String s ="12/15|22:58:25|B|99.502||||A|100.501|||lol||";
长度是13！ 怎么会？似乎 java 进行了某种优化，这不是必需的，因为字符串的那些部分可以在其他上下文中填充...
默认情况下 split 从结果数组中删除尾随的空字符串。要关闭此机制，请使用 split(regex, limit) 和负限制，如
split("\|", -1)
更多细节：
split(regex) 内部 returns split(regex, 0) 的结果，在这个方法的 documentation 中你可以找到（强调我的）
The
limitparameter controls the number of times the pattern is applied and therefore affects the length of the resulting array.If the limit
nis greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter.If
nis non-positive then the pattern will be applied as many times as possible and the array can have any length.If
nis zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.