My String won't trim

[Elouise Kivineva]

I have a GUI with a JPassword field named pswrd.
When I read the entered password I save it in a String
named password and trim to get out leading and trailing
empty spaces (user pressed the space bar).

String password = String.valueOf( pswd.getPassword() );
password.trim();

but when I print the password (using a JOptionPane)

JOptionPane.showMessageDialog( null, "*" + password + "*" );

to check that the empty spaces are gone, they never are.
Why, and what can I do about it?
Thanks!

[Joe Pluta]

This is a standard mistake when working with Strings. Strings are immutable, meaning they do not change. The syntax "password.trim();" does nothing to the original String, it simply returns a NEW String with the spaces trimmed off. The following modification will work:
password = password.trim();
Hope this helps.
Joe

[Ransika deSilva]

Hello,
Hope this too clarify the answer, according to the API specification of the String class,
trim()
Returns a copy of the string, with leading and trailing whitespace omitted.
Important thing to note here is that, it returns a String.
Better check the API if you get similar problems.
Cheers...........

[Amin Rais]

String in Java is immutable. So you can't change it instead get the new trimmed String.

[Elouise Kivineva]

Oh geez! I really should have seen that...
Thanks ya'll, Elouise