Best way to implement tooltips for JTree?

public class JTreeWithToolTips {
    private static class OwnRenderer extends DefaultTreeCellRenderer {
    	@Override
    	public Component getTreeCellRendererComponent(JTree tree, Object value,
    			boolean sel, boolean expanded, boolean leaf, int row,
    			boolean hasFocus) {
    		setToolTipText("foobar" + row);
    		return super.getTreeCellRendererComponent(tree, value, sel,
    				expanded, leaf, row, hasFocus);
    	}
    }

    public static void main(String[] args) {
    	JTree tree = new JTree(new Object[] { "foo", "bar", "foobar" });
    	tree.setCellRenderer(new OwnRenderer());
    	ToolTipManager.sharedInstance().registerComponent(tree);

    	JFrame frame = new JFrame();
    	frame.getContentPane().add(tree);
    	frame.pack();
    	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	frame.setVisible(true);
    }
}