输入为空时 String.split() 的行为 [英] Behaviour of String.split() when input is empty

问题描述

正如标题解释查询

有人可以解释以下两个输出的行为吗.

"".split(",").length

给出输出

1

在哪里

",".split(",").length

给出输出

<预><代码>0

解决方案

第一种情况，返回原始字符串，因为没有找到分隔符.

来自 API 文档:

<块引用>

如果表达式不匹配输入的任何部分，则结果数组只有一个元素，即这个字符串.

As the title explains the query

Can somebody please explain the behavior of following two outputs.

"".split(",").length

gives output

1

where as

",".split(",").length

gives output

0

解决方案

In the first case, the original string is returned, because the separator is not found.

From the API docs:

If the expression does not match any part of the input then the resulting array has just one element, namely this string.

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