Java character validation

Hi there,
I know this question may seem very elementary, but I was wondering. Would anyone know the opposite of:
Character.isDigit(myVariable.charAt(0))I tried using this below but it didn't do anything:
!Character.isDigit(myVariable.charAt(0))Is there something that I am doing wrong?
Thanks

Hi,
It seems that I have discovered what the issue was. I was actually using the above code in a conditional in collaboration with a string length check such as the one below:
(myVariable.length() != 1) && (!Character.isDigit(MyVariable.charAt(0)))It was however not validating for a single letter that was typed. What I should have done as I later discovered was
(myVariable.length() != 1) || (!Character.isDigit(MyVariable.charAt(0)))So that it validates either condition and does not exhibit weird behaviour. However, I wonder if someone could please explain why in the previous syntax it was not validating for a single letter typed.

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There's a number of posts on this topic, so I'm not going to repeat it here. Please, check the following entries in this forum:
http://forum.java.sun.com/thread.jsp?forum=34&thread=158734
http://forum.java.sun.com/thread.jsp?forum=34&thread=159320
http://forum.java.sun.com/thread.jsp?forum=34&thread=172123
http://forum.java.sun.com/thread.jsp?forum=34&thread=153776
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After writing a test class I found that I was probably over concerned about the performance hit:
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