java – 将JScrollPane添加到显示图像的面板

扩展jpanel以显示图像的类：

public class ShowPanel extends JPanel{

public ShowPanel(BufferedImage image,int height,int width) {
  this.image = image;
  this.height = height;
  this.width = width;
  //this.setBounds(width,width,height);

}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawImage(image,height,null);
}

public void setImage(BufferedImage image,int width) {
    this.image = image;
    this.height = height;
    this.width = width;

}

private BufferedImage image;
private int height;
private int width;

}

还有一个主框架样本,它有另一个名为imageContainer的面板来保存显示面板：

public class MainFrame extends javax.swing.JFrame {

/** Creates new form MainFrame */
public MainFrame() {
    initComponents();
    image = null;
    path = "PantherOnLadder.gif";
    image = Actions.loadImage(path);
    showPanel = new ShowPanel(image,0);
    spY = toolBar.getY() + toolBar.getHeight();
    showPanel.setBounds(0,spY,image.getWidth(),image.getHeight());
    showPanel.repaint();
    imageContainer.add(showPanel);
    JScrollPane scroller = new JScrollPane(imageContainer);
    scroller.setAutoscrolls(true);


}

那我在这里做的错误是什么？