仅从字符串的右侧删除空格 [英] Remove whitespaces only from the right side of a String

问题描述

我有一个 String printerName; 长度为 256 个字符.我需要从字符串的右侧删除空格，以便我只得到一个有效的打印机名称.

I have a String printerName; which is 256 characters long. I need to remove whitespaces from right side of the String so that I get only a valid printer name.

这个解决方案:

st.replaceAll("\\s+","")

不起作用，因为有效的 printerName 可以有空格.而且我不知道要删除多少个字符，因为可以有很多打印机.对此的最佳解决方案是什么?

doesn't work, because a valid printerName can have a whitespaces. And I don't know how many characters I have to delete, becouse there can be many printers. What's the best solution for this?

推荐答案

如果您只想删除右侧(而不是左侧)的空格，您可以使用:

If you only want to remove the spaces on the right (but not on the left) you can use:

st.replaceAll("\\s+$", "");

$ 锚表示字符串的结尾.

The $ anchor meaning the end of the string.

如果您不介意删除字符串开头的空格，那么:

If you don't mind removing spaces at the beginning of the string as well, then:

st.trim()

会解决问题.

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