Java: getting incorrect string.length() after using trim()

Question

I have the string "22" and I'm getting 3 as length;

I used .trim()

What else could be a reason for this?

Answer 1

You should be giving us code that demonstrates the problem, but my guess is you did something like this:

String str = "22 ";
str.trim();
System.out.println(str.length());

But str.trim() doesn't change str (as Strings are immutable). Instead it returns a new String trimmed. So you need something like this:

String str = "22 ";
str = str.trim();
System.out.println(str.length());

Answer 2

Try this:

System.out.println(java.util.Arrays.toString(theString.toCharArray()));

This dumps the char[] version of the String, so we can perhaps see if it contains anything funny.