How do i calculate the scrollpane value

hi all, how do i calculate the scrollpane value dynamically?
thanks a lot

hi sorry for the lousy information, because i was in the hurry.
hm... should be describe in this way, in VB i know how to get the value of scrollbar when the scrollbar being scroll, but i do not know how to done it in JAVA.
i have my sample code as following:
        sp.addComponentListener(new ComponentAdapter() {
            public void scrolled(ComponentEvent evt) {
                width = getWidth();
                height = getHeight();
        });any idea? izzit correct? it just show nothing while i use to print at console

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