Java Coding Problems

21. Removing leading and trailing spaces

The quickest solution to this problem probably relies on the String.trim() method. This method is capable of removing all leading and trailing spaces, that is, any character whose code point is less than or equal to U+0020 or 32 (the space character):

String text = "\n \n\n hello \t \n \r";String trimmed = text.trim();

The preceding snippet of code will work as expected. The trimmed string will be hello. This only works because all of the white spaces that are being used are less than U+0020 or 32 (the space character). There are 25 characters (https://en.wikipedia.org/wiki/Whitespace_character#Unicode) defined as white spaces and trim() covers only a part of them (in short, trim() is not Unicode aware). ...