import javax.swing.tree.*;
import org.alice.apis.moveandturn.*;

    DefaultTreeModel model;
    DefaultMutableTreeNode act;
 
    public void open (Object s)
    {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode (s);
        if (model == null)
        {
            model = new DefaultTreeModel (node);
            jTree1.setModel (model);
        }
        else
        {
            int inx = act.getChildCount();
            model.insertNodeInto (node, act, inx);
        }
        act = node;
    }
 
    public void put (Object s)
    {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode (s);
        int inx = act.getChildCount();
        model.insertNodeInto (node, act, inx);
    }
 
    public void close ()
    {
       act = (DefaultMutableTreeNode) act.getParent();
    }
 
    public void test ()
    {
        open ("branch");
        put ("item");
 
        open ("another branch");
        put ("anotheritem");
        close ();
 
        close ();
    }        
 
    public void detail (Composite c)
    {
        // import org.alice.apis.moveandturn.*;
        open (c.getName());
        Transformable [] a = c.getComponents();
        for (Transformable t : a)
        {
            if (t instanceof Composite)
                detail ( (Composite) t );
        }
        close ();
    }
 
    public void info (Composite c)
    {
        detail (c);
    }

    public void run() 
    {
        Window w = new Window ();
        w.setVisible (true);
        w.info (this);
 
        ...
 
    }