我有点卡住。当我按下按钮Submit时，应该在JLabel图像的相同位置重新显示另一张图片，因此，如果有人有任何想法，我将感谢他们使用eclipse，并且该程序正在编译并运行。这是代码

/** Here is the GUI of the program
 * class name SlideShowGui.java
 * @author Kiril Anastasov
 * @date 07/03/2012
 */

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class SlideShowGui extends JPanel  implements ActionListener
{
    JLabel name, comments, images;
    JTextField namejtf, commentsjtf, captionjtf;
    JButton submit;
    ImageIcon pictures;


    SlideShowGui()
    {


        name = new JLabel("Name:");
        this.add(name);

        namejtf = new JTextField(15);
        this.add(namejtf);

        comments = new JLabel("Comments:");
        this.add(comments);

        commentsjtf = new JTextField(15);
        this.add(commentsjtf);

        submit = new JButton("Submit");
        this.add(submit);
        submit.addActionListener(this);


        pictures = new ImageIcon("galileo1.jpg");
        images = new JLabel(pictures);
        this.add(images);


//      pictures2 = new ImageIcon("galileo2.jpg");
//      images2 = new JLabel(pictures2);
//      this.add(images2);



        captionjtf = new JTextField(24);
        this.add(captionjtf);

           public void actionPerformed(ActionEvent ae)
        {
        if(ae.getSource() == submit)
        {

            pictures = new ImageIcon("galileo2.jpg");
            images = new JLabel(pictures);

            System.out.println("test");
        }

    }
}

    }

/**The driver class of the program. Here is the JFrame 
 * class name TestSlideShow.java
 * @author Kiril Anastasov
 * @date 07/03/2012
 */

import java.awt.*;
import javax.swing.*;
public class TestSlideShow 
{
    public static void main(String[] args) 
    {
        JFrame application = new JFrame();
        SlideShowGui panel = new SlideShowGui();
        application.add(panel);
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        application.setSize(300,600);
        application.setLocation(400,100);
        application.setVisible(true);


    }

}