问题描述
今天发生在我的java的行为 String.split（）是很奇怪的。
It occured to me today the behavior of java String.split() is very strange.
其实我想要分割字符串AA，BB，CC，DD ,,, EE来阵列由 .split（ ）这给了我一个String数组 [AA，BB，抄送，DD，，，EE] 长7。
Actually I want to split a string "aa,bb,cc,dd,,,ee" to array by .split(",") that gives me a String array ["aa","bb","cc","dd","","","ee"] of length 7.
但是当我尝试拆分字符串AA，BB，CC，DD ,,,,来排列这给了我一个长度为4的数组只是意味着 [AA，BB，抄送，DD] 拒绝所有一个空白字符串。
But when I try to split a String "aa,bb,cc,dd,,,," to array this gives me a array of length 4 means only ["aa","bb","cc","dd"] rejecting all next blank Strings.
我要那个分裂像AA，BB，CC，DD ,,,,来阵列 [AA的字符串的程序，BB，抄送，DD，，，] 。
I want a procedure that splits a String like "aa,bb,cc,dd,,,," to array ["aa","bb","cc","dd","","",""].
这可能与java.lang.String中的API？先谢谢了。
Is this possible with java.lang.String api? Thanks in advance.
推荐答案
使用String.split(String正则表达式，INT限制） 负限制（例如-1）。
Use String.split(String regex, int limit) with negative limit (e.g. -1).
"aa,bb,cc,dd,,,,".split(",", -1)
在String.split(String正则表达式） 被调用时，它被称为与限制 = 0，这将删除阵列中的所有尾随空字符串（在大多数情况下，见下文）。
When String.split(String regex) is called, it is called with limit = 0, which will remove all trailing empty strings in the array (in most cases, see below).
的实际行为 String.split（字符串正则表达式）还是比较混乱的：
The actual behavior of String.split(String regex) is quite confusing:
，或;;;与正则表达式是，将导致空数组。的非空字符串分割将导致删除阵列中的所有尾随空字符串的
Splitting an empty string will result in an array of length 1. Empty string split will always result in length 1 array containing the empty string.
Splitting ";" or ";;;" with regex being ";" will result in an empty array. Non-empty string split will result in all trailing empty strings in the array removed.
以上可以观察到至少5的Java到Java 8。行为
The behavior above can be observed from at least Java 5 to Java 8.
有是企图去改变在拆分 JDK-6559590 。然而，它很快就在 JDK-8028321 恢复时，它会导致回归在不同的地方。这种变化从不入初始Java 8版本。
There was an attempt to change the behavior to return an empty array when splitting an empty string in JDK-6559590. However, it was soon reverted in JDK-8028321 when it causes regression in various places. The change never makes it into the initial Java 8 release.