Re: running a class from another class

Ok, I tried to simplify it : I'm experimenting by trying to make an
instance called "Pre_01" of the class CopyOfTreeView from the little
class 1.

Class 1 :
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package roddemo;

public class Lance {
    public static void main(String[] argv) {
        CopyOfTreeView Pre_01 = new CopyOfTreeView(null, null);
    }
}
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Class 2 :
(was long, I trimed it, but kept all the classes/constructor, etc. as
well as the main method. BTW, am I supposed to keep the "main" in this
class or should I rename it?)
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package roddemo;
import java.awt.BorderLayout;
....
public class CopyOfTreeView extends Display {
    private static final String tree = "tree";
    ...
    public CopyOfTreeView(Tree t, String label) {
    ...
    }
    public void setOrientation(int orientation) {
    ...
        }
        ...
    }
    public int getOrientation() {
        ...
    }
    public static void main(String argv[]) {
        String infile = TREE_CHI;
        String label = "name";
        if ( argv.length > 1 ) {
            infile = argv[0];
            label = argv[1];
        }
        JComponent treeview = demo(infile, label);
        JFrame frame = new JFrame("p r e | v i e w");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(treeview);
        frame.pack();
        frame.setVisible(true);
    }
    public static JComponent demo() {
        ...
    }
    public static JComponent demo(String datafile, final String label)
{
        ...
    }
    public class OrientAction extends AbstractAction {
        ...
    }
    public class AutoPanAction extends Action {
    ...
    }
    public static class NodeColorAction extends ColorAction {
    ...
    } // end of inner class TreeMapColorAction
} // end of class TreeMap
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This produces a few errors (refering to the library I'll using) :
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Exception in thread "main" java.lang.IllegalArgumentException:
Unsupported TupleSet type.
    at prefuse.Visualization.add(Visualization.java:245)
    at prefuse.Visualization.add(Visualization.java:220)
    at roddemo.CopyOfTreeView.<init>(CopyOfTreeView.java:91)
    at roddemo.Lance.main(Lance.java:5)
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