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From: Jim Janney <jjanney@shell.xmission.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: how to trim() a String only at the right side?
Date: Wed, 25 Sep 2013 13:05:25 -0600
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Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> writes:

> I'd need to trim only *trailing* whitespace off a String (or StringBuilder)
> while preserving leading white space. Furthermore (unlike trim()), I'd only
> strip exact \u0020 chars, no other control chars.
>
> I could code a while-loop to search for last non-\u0020 char position and then
> extract the approriate substring (or delete() the spaces), but if there is a
> more elegant solution that I've missed in the javadocs, then I'd be glad about
> a hint.  
>
> PS: no need to code out any solutions involving explicit loops.
> PPS: target is Java SE 7

  public static CharSequence trimEnd(CharSequence s) {
    return s.length() == 0 || s.charAt(s.length() - 1) != ' ' ? s :
           trimEnd(s.subSequence(0, s.length() - 1));
  }

No explicit loops, works on String and StringBuilder.  :-)

Also, Apache StringUtils has a stripEnd() method.

-- 
Jim Janney