how to check if a String is empty?

[Marten Lehmann]

Hello,
maybe this is not the perfect group for my question, but as my problem 
appears at the development of JSPs and tomcat is concerned with that, I 
hope you can answer it.

I often see the condition
String test = req.getParameter("test");
if (test == null) {
        /* string is empty */
} else {
        /* string contains something */
}
But if test contains just blanks and other whitespaces, it's not null, 
but doesn't contain usable data anyhow. How can I check if a string 
contains whitespaces only? I though of something like

if (test == null || test.trim().equals("")) {
}
but there's no trim()-function, right? How do you solve this problem? 
With whitespaces I mean blanks, tabs and newlines.

Regards
Marten
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