swing 重绘

public void update(Observable o, Object arg) {
        YardZoneComboxHandler yzch=(YardZoneComboxHandler)o;
        Map map=yzch.map;
        if(null!=map &&map.size()>1){
            lrlist=map;
            Rectangle     bor = yardZoneCob.getBounds();
            searchPanel.remove(yardZoneCob);
            leftList=(List)lrlist.get("leftYard");
            rightList=(List)lrlist.get("rightYard");          
            yardZoneCob = YardZoneJComboBoxBO.getInstance().getJComboBox(leftList, (List)lrlist.get("rightYard"));

            yardZoneCob.setBounds(bor);
            yardZoneCob.addActionListener(new CommandAction());
            Graphics g=this.getGraphics();
            paintComponents(g);
            searchPanel.repaint();
            this.repaint();
        }

 

//覆盖

public void paintComponents (Graphics g){       
        yardZoneCob.setVisible(true);
        searchPanel.add(yardZoneCob,new GBC(1,1).setInsets(8, 10, 5, 0).setAnchor(GBC.WEST));
        super.paintComponents(g);//使页面正常显示
    }