title: List Display Panel does not work properly
body: <p>I saw a piece of code on this website <a href="https://stackoverflow.com/a/25170471/230513">https://stackoverflow.com/a/25170471/230513</a> which creates a panel and splits the screen into 2 halves.</p>
  
  <p>What I want is for the user to click on an icon and then get confirmation, which then gets put onto Panel 1. The user should then pick another icon and that should go to panel 2. At the moment, if the user clicks on one icon it displays on both panels.</p>
  
  <p>This is the code;</p>
  
  <pre><code>package GUI;
  
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.EventQueue;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.GridLayout;
  import java.awt.RenderingHints;
  import java.awt.image.BufferedImage;
  import javax.swing.BorderFactory;
  import javax.swing.DefaultListCellRenderer;
  import javax.swing.DefaultListModel;
  import javax.swing.Icon;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.JList;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JSplitPane;
  import javax.swing.ListSelectionModel;
  import javax.swing.UIManager;
  import javax.swing.event.ListSelectionEvent;
  import javax.swing.event.ListSelectionListener;
  
  /**
   * @see https://stackoverflow.com/a/25170471/230513
   */
  public class ListDisplayPanel extends Component{
      private JPanel contentPane;
  
      private static final Icon icon = UIManager.getIcon("html.pendingImage");
  
      private ListPanel listPanel = new ListPanel();
      private DisplayPanel displayPanel1 = new DisplayPanel();
      private DisplayPanel displayPanel2 = new DisplayPanel();
      private JPanel dpHold = new JPanel();
  
      private class DisplayPanel extends JPanel {
  
          private static final int SIZE = 256;
          private JLabel label = new JLabel();
  
          public DisplayPanel() {
              this.add(label);
          }
  
          @Override
          protected void paintComponent(Graphics g) {
              super.paintComponent(g);
              BufferedImage img = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
              Graphics2D temp = (Graphics2D) img.getGraphics();
              icon.paintIcon(this, temp, 0, 0);
              temp.dispose();
              Graphics2D g2d = (Graphics2D) g;
              g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
              g2d.drawImage(img, 0, 0, getWidth(), getHeight(), this);
          }
  
          @Override
          public Dimension getPreferredSize() {
              return new Dimension(500, 500);
          }
      }
  
      private class ListPanel extends JPanel {
  
          private static final int N = 5;
          private DefaultListModel dlm = new DefaultListModel();
          private JList list = new JList(dlm);
  
          public ListPanel() {
              super(new GridLayout());
              for (int i = 0; i &lt; N * N; i++) {
                  String name = "Cell-" + String.format("%02d", i);
                  dlm.addElement(name);
              }
              list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
              list.setLayoutOrientation(JList.HORIZONTAL_WRAP);
              list.setVisibleRowCount(N);
              list.setCellRenderer(new ListRenderer());
              list.addListSelectionListener(new SelectionHandler());
              this.add(list);
          }
  
          private class ListRenderer extends DefaultListCellRenderer {
  
              @Override
              public Component getListCellRendererComponent(JList list,
                      Object value, int index, boolean isSelected, boolean cellHasFocus) {
                  JLabel label = (JLabel) super.getListCellRendererComponent(
                          list, value, index, isSelected, cellHasFocus);
                  label.setBorder(BorderFactory.createEmptyBorder(N, N, N, N));
                  label.setIcon(icon);
                  label.setHorizontalTextPosition(JLabel.CENTER);
                  label.setVerticalTextPosition(JLabel.BOTTOM);
                  return label;
              }
          }
  
          private class SelectionHandler implements ListSelectionListener {
  
              @Override
              public void valueChanged(ListSelectionEvent e) {
                  if (!e.getValueIsAdjusting()) {
                      displayPanel1.label.setText((String) dlm.getElementAt(e.getLastIndex()));
                      displayPanel2.label.setText((String) dlm.getElementAt(e.getLastIndex()));
                  }
              }
          }
      }
  
      private void display() {
          JFrame f = new JFrame("Generate");
          f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          JSplitPane jsp = new JSplitPane();
          jsp.setLeftComponent(new JScrollPane(listPanel));
          JSplitPane jsp2 = new JSplitPane();
          jsp2.setTopComponent(displayPanel1);
          jsp2.setBottomComponent(displayPanel2);
          jsp.setRightComponent(jsp2);
          f.add(jsp);
          f.pack();
          f.setLocationRelativeTo(null);
          f.setVisible(true);
      }
  
      public static void main(String[] args) {
          /*EventQueue.invokeLater(() -&gt;*/ {
              new ListDisplayPanel().display();
          };
      }
  }
  </code></pre>