字符串split()方法，零极限和负极限 [英] String split() method, zero and negative limit

问题描述

http://www.tutorialspoint.com/java/java_string_split.htm

这里是此方法的语法: public String [] split(String regex，int limit)或 public String [] split(String regex)

Here is the syntax of this method: public String[] split(String regex, int limit) or public String[] split(String regex)

在上面的链接中，我可以理解 Str.split(-"，2)和 Str.split(-"，3)示例.

In the above link, I can understand the Str.split("-", 2) and Str.split("-", 3) examples.

但是，我不太了解 Str.split(-"，0)，零为零的作用是什么?在某些示例中，我还遇到了负限制，这是什么?

However, I don't quite get the Str.split("-", 0), what's the role of zero of the limit? In some examples, I have also encountered negative limits, what is this?

推荐答案

limit 参数控制模式的应用次数，因此会影响生成的 array .对于此限制，我们有 3 个可能的值:

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. We have 3 possible values for this limit:

1. 如果限制 n 大于零，则该模式将最多应用 n-1 次， array的长度将不大于 n ，并且 array的的最后一个条目将包含除最后匹配的定界符之外的所有输入.

1. 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.

如果 n 是非正数，则该模式将被尽可能多地应用，并且 array 可以具有任意长度.

If n is non-positive then the pattern will be applied as many times as possible and the array can have any length.

如果 n 为零，则该模式将被尽可能多地应用， array 可以具有任意长度，并且尾随的空字符串将被丢弃.

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.

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