关于paint（）的刷新有关问题（拼图游戏）

/* *author:a276202460 *crete date:2009-6-17 */import java.awt.Graphics;import java.awt.Image;import java.awt.Point;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionAdapter;import javax.swing.JPanel;public class Imgpanel extends JPanel {    private static final long serialVersionUID = 1L;    private String imgpath;    public Imgpanel() {        initlistener();    }    public void paint(Graphics g) {        super.paint(g);        if (imgpath != null) {            for (int i = 0; i < GameFactory.ycount; i++) {                for (int j = 0; j < GameFactory.xcount; j++) {                    if (GameFactory.pointsimage[i][j] != -1) {                        g.drawImage((Image) GameFactory.imagelist.get(GameFactory.pointsimage[i][j]),                                GameFactory.gaphblock[i][j].x, GameFactory.gaphblock[i][j].y,                                GameFactory.gaphblock[i][j].width,    GameFactory.gaphblock[i][j].height, this);                    }                }            }            if (Gameconsole.selectxindex != -1 && Gameconsole.selectyindex != -1) {                g.drawRect(    GameFactory.gaphblock[Gameconsole.selectyindex][Gameconsole.selectxindex].x,                        GameFactory.gaphblock[Gameconsole.selectyindex][Gameconsole.selectxindex].y,                        GameFactory.gaphblock[Gameconsole.selectyindex][Gameconsole.selectxindex].width,                        GameFactory.gaphblock[Gameconsole.selectyindex][Gameconsole.selectxindex].height);            }        }    }    public String getImgpath() {        return imgpath;    }    public void setImgpath(String imgpath) {        this.imgpath = imgpath;        // registpanelsize();        GameFactory.loadimage(imgpath);        Gameconsole.dispersesubimg();        repaint();    }    public void registpanelsize() {        GameFactory.panelwidth = getSize().width;        GameFactory.panelheight = getSize().height;        if (GameFactory.image != null) {            GameFactory.initblocks();            repaint();        }    }    public void initlistener() {        MouseAda ma = new MouseAda();        this.addMouseListener(ma);        MouseMv mv = new MouseMv();        this.addMouseMotionListener(mv);    }    class MouseAda extends MouseAdapter {        @Override        public void mouseClicked(MouseEvent e) {            subimgmv(e);        }    }    public void subimgmv(MouseEvent e) {        if (GameFactory.gaphblock == null) {            return;        }        if (Gameconsole.movesubimg(e.getPoint())) {            if (Gameconsole.issuccess()) {                GameFactory.pointsimage[GameFactory.ycount - 1][GameFactory.xcount - 1] = GameFactory.ycount                        * GameFactory.xcount - 1;            }            repaint();        }    }    class MouseMv extends MouseMotionAdapter {        @Override        public void mouseMoved(MouseEvent e) {            Point p = e.getPoint();            if (GameFactory.gaphblock == null) {                return;            }            if (Gameconsole.selectsubimg(p)) {                repaint();            }        }    }}