[Java-gnome-developer] About java-gnome and gtkmm ,swing,swt?

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 hello,I want to study java-gnome,but I have some puzzled problems.
is java-gnome superior to gtkmm(the C++ implement of gtk+) in performance?
And can anyone help me compare their advantage and disadvantage
(including their performance)among java-gnome ,swing and swt?

please help !
Thank you very much ?