关于JSCrollPane

[zhou3724042]

public class GraphFrame extends JInternalFrame{

private GraphPanel panel;
private JScrollPane scroll;

GraphFrame(String title) throws Exception{
super(title, true, true, true, true);

panel = new GraphPanel("G:\\Picture\\WallPaper\\shanks1.jpg");
scroll = new JScrollPane(panel);
scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

this.setLayout(new BorderLayout());
this.getContentPane().add(scroll, BorderLayout.CENTER);

this.setSize(400, 300);
this.setVisible(true);

}
}

GraphPanel类是画了一副图的JPanel,现在是这样写的，想做出滚动条的效果，滚动条内部是图片，就是怎么弄也弄不出来

[wyyl00]

代码不全 父类是什么东西