java swing JScrollPane滚动条滚到底部

java swing 如何设置JScrollPane滚动条 到底部

 

 /***
     * 增加参数后,使滚动条自动定位到底部
     * @param panel_7JS2
     */
    public static void scrollToBottom(JScrollPane panel_7JS2) {
        int maxHeight = panel_7JS2.getVerticalScrollBar().getMaximum();
//                System.out.println(vscrollHeight);
        panel_7JS2.getViewport().setViewPosition(new Point(0, maxHeight));
        panel_7JS2.updateUI();
    }