how can create pop() method in this program ,Or how can delete image in it when i press pop button in runtime ??? please help me ...

// these image that put in program must be in the same folder that saved the program . //AlbumInJava.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.io.*;

public class AlbumInJava extends JPanel { static int size=5; static String aray[] =new String [size]; static int top=-1;

  public  static void push(String item)
   {
if (top+1>=size)
JOptionPane.showMessageDialog(null," Album is Full you can not push the image .");
else
top=top+1;
aray[top]=item;
      }

 public static void pop()
 {

    //  what are these code that must be write in this method ?

     }

    ImageIcon[] images;
    static JPanel p;
static JTextField t;
static JLabel l;
    static JButton b = new JButton("push");
    static JButton b1 = new JButton("pop");
    static  String z;
    static JList namelist;

    public AlbumInJava()
  {
    super(new BorderLayout());
    //Load the pet images and create an array of indexes.
    images = new ImageIcon[aray.length];
    Integer[] intArray = new Integer[aray.length];
    for (int i = 0; i < aray.length; i++)
    {
        intArray[i] = new Integer(i);
        images[i] = createImageIcon(aray[i] + ".jpg");
        if (images[i] != null)
        {
            images[i].setDescription(aray[i]);
        }
    }
    //Create the combo box.
    JComboBox petList = new JComboBox(intArray);
    ComboBoxRenderer renderer= new ComboBoxRenderer();
    renderer.setPreferredSize(new Dimension(600, 200));
    petList.setRenderer(renderer);
    petList.setMaximumRowCount(2);

    //Lay out the demo.
    add(petList, BorderLayout.PAGE_END);
    setBorder(BorderFactory.createEmptyBorder(20,20,20,20));

    p = new JPanel(new GridLayout(3, 3));
    t = new JTextField("pic ()",0);

l = new JLabel("Enter The Name Image ");

p.add(l);
p.add(t);
p.add(b);
    p.add(b1);
 }

/** Returns an ImageIcon, or null if the path was invalid. */
 static ImageIcon createImageIcon(String path)
 {
java.net.URL img = AlbumInJava.class.getResource(path);// please what dose the work ?
    if (img != null)
    {
        return new ImageIcon(img);
    }

    return null;
}
public static void doThis()// what dose the work method ?
{
    push(z);
}

static JFrame frame;
static JComponent newContentPane;
/**
 * Create the GUI and show it.  For thread safety,
 * this method should be invoked from the
 * event-dispatching thread.
 */
private static void createAndShowGUI() {
    //Create and set up the window.

    frame = new JFrame("My Album ");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Create and set up the content pane.
    newContentPane = new AlbumInJava();
    newContentPane.setOpaque(true); //content panes must be opaque
    frame.setContentPane(newContentPane);

    frame.getContentPane().add(p, BorderLayout.PAGE_START);

    //Display the window.
    frame.pack();
    frame.setVisible(true);
}


public static void main(String[] args)
{
 javax.swing.SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            createAndShowGUI();
            }
        }
    );
    b.addActionListener( new ActionListener()
   {
    public void actionPerformed(ActionEvent e)
{
if(e.getSource() == b)
{
            z = t.getText();
            doThis();
            newContentPane = new AlbumInJava();
                        newContentPane.setOpaque(true);
                frame.setContentPane(newContentPane);       frame.getContentPane().add(p, BorderLayout.PAGE_START);
          frame.pack();// what dose the work method ?

} if(e.getSource() == b1) { pop();// i wont if i press (b1) button call pop(), and one image removed. how ? } } } ); }

class ComboBoxRenderer extends JLabel
                    implements ListCellRenderer {
    private Font uhOhFont;
    public ComboBoxRenderer() {
        setOpaque(true);
        setHorizontalAlignment(CENTER);
        setVerticalAlignment(CENTER);
    }

    /*
     * This method finds the image and text corresponding
     * to the selected value and returns the label, set up
     * to display the text and image.
     */
    public Component getListCellRendererComponent(
                                       JList list,
                                       Object value,
                                       int index,
                                       boolean isSelected,
                                       boolean cellHasFocus) {
        //Get the selected index. (The index param isn't
        //always valid, so just use the value.)
        int selectedIndex = ((Integer)value).intValue();

        if (isSelected) {
            setBackground(list.getSelectionBackground());
            setForeground(list.getSelectionForeground());
        } else {
            setBackground(list.getBackground());
            setForeground(list.getForeground());
        }

        //Set the icon and text.  If icon was null, say so.
        ImageIcon icon = images[selectedIndex];
        String pet = aray[selectedIndex];
        setIcon(icon);
        if (icon != null) {
            setText(pet);
            setFont(list.getFont());
        } else {
            setUhOhText(pet + " (no image available)",
                        list.getFont());
        }

        return this;
    }

    //Set the font and text when no image was found.
    protected void setUhOhText(String uhOhText, Font normalFont) {
        if (uhOhFont== null) { //lazily create this font
            uhOhFont = normalFont.deriveFont(Font.ITALIC);
        }
        setFont(uhOhFont);
        setText(uhOhText);
    }
}

}