The String class contains two methods to remove leading and trailing whitespaces: trim() and strip(). The strip() method was added to the String class in Java 11. The strip() method uses the Character.isWhitespace() method to check if the character is a whitespace. This method uses Unicode code points, while the trim() method identifies any character with a codepoint value less than or equal to U+0020 as a whitespace character.
The strip() method is the recommended way to remove whitespaces because it uses the Unicode standard.
Tip: Because String is immutable, you have to assign the strip() output to the string.