How to programmatically click a tree node(make it selected)?

in my program, i want to make a tree node "clicked" by codes, so that the valueChanged(TreeSelectionEvent tse e) method of the TreeSelectionListener can be invoked.
thanks a lot!!

    private Robot robot;
    private void triggerMouseClick(TreePath treePath) {
        if (robot == null) {
            try {
                robot = new Robot();
                robot.setAutoDelay(60);
            catch (AWTException e) {
                e.printStackTrace();
        Rectangle rect = this.getPathBounds(treePath);
        Point point = new Point(rect.x+1, rect.y+1);
        SwingUtilities.convertPointToScreen(point, this);
        robot.mouseMove(point.x, point.y);
        robot.mousePress(InputEvent.BUTTON1_MASK);
        robot.mouseRelease(InputEvent.BUTTON1_MASK);
    }

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    Thanks

    Thanks
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