Java：String split（）：我希望它在末尾包含空字符串 [英] Java: String split(): I want it to include the empty strings at the end

问题描述

我有以下字符串：

String str = "\nHERE\n\nTHERE\n\nEVERYWHERE\n\n";

如果您只是打印它，它会输出这样的（当然 \ n 不会逐字打印）：

If you just print this, it would output like this (Of course the \n wouldn't be "literally" printed):

\n
HERE\n
\n
THERE\n
\n
EVERYWHERE\n
\n
\n

当我调用方法 split（\ n），我想获得新行（ \ n ）字符之间的所有字符串，甚至是最后的空字符串。

When I call the method split("\n"), I want to get all strings between the new line (\n) characters even empty strings at the end.

例如，如果我今天这样做：

For example, if I do this today:

String strArray[] = str.split("\n");

System.out.println("strArray.length - " + strArray.length);
for(int i = 0; i < strArray.length; i++)
    System.out.println("strArray[" + i + "] - \"" + strArray[i] + "\"");

我希望它打印出来（输出A）：

I want it to print out like this (Output A):

strArray.length - 8
strArray[0] - ""
strArray[1] - "HERE"
strArray[2] - ""
strArray[3] - "THERE"
strArray[4] - ""
strArray[5] - "EVERYWHERE"
strArray[6] - ""
strArray[7] - ""

目前，它打印如下（输出B ），并且跳过任何结束的空字符串：

Currently, it prints like this (Output B), and any ending empty strings are skipped:

strArray.length - 6
strArray[0] - ""
strArray[1] - "HERE"
strArray[2] - ""
strArray[3] - "THERE"
strArray[4] - ""
strArray[5] - "EVERYWHERE"

如何进行拆分（ ）方法包括输出A中的空字符串？当然，我可以编写一行多行代码，但想知道，在我浪费时间尝试实现之前，如果有一个简单的方法或额外的两行左右的代码来帮助我。谢谢！

How do I make the split() method include the empty strings like in Output A? I, of course, could write a multi-line piece of code, but wanted to know, before I waste my time trying to implement that, if there was a simple method or an extra two or so lines of code to help me. Thanks!

推荐答案

使用 str.split（\ n，-1）（带负限制参数）。当 split 被赋予零或没有 limit 参数时，它会丢弃尾随空字段，并且当它被赋予正<$ c时$ c> limit 参数它将字段数限制为该数字，但否定限制意味着允许任意数量的字段而不丢弃尾随空字段。 此处并且行为来自Perl。

use str.split("\n", -1) (with a negative limit argument). When split is given zero or no limit argument it discards trailing empty fields, and when it's given a positive limit argument it limits the number of fields to that number, but a negative limit means to allow any number of fields and not discard trailing empty fields. This is documented here and the behavior is taken from Perl.

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