Java by API/javax.swing/ListModel

implements ListModel

   <source lang="java">

// import java.awt.ruponent; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.ListCellRenderer; import javax.swing.ListModel; import javax.swing.event.ListDataListener; public class MainClass extends JFrame {

 MainClass(String s) {
   super(s);
   ListModel lm = new StaticListModel();
   JList list = new JList();
   list.setModel(lm);
   list.setCellRenderer(new MyCellRenderer());
   getContentPane().add(new JScrollPane(list));
   setDefaultCloseOperation(EXIT_ON_CLOSE);
 }
 public static void main(String[] s) {
   MainClass l = new MainClass("ListModel");
   l.pack();
   l.setVisible(true);
 }
 class MyCellRenderer extends JLabel implements ListCellRenderer {
   public Component getListCellRendererComponent(JList list, Object value, int index,
       boolean isSelected, boolean cellHasFocus) {
     Component c = null;
     if (value == null) {
       c = new JLabel("(null)");
     } else if (value instanceof Component) {
       c = (Component) value;
     } else {
       c = new JLabel(value.toString());
     }
     if (isSelected) {
       c.setBackground(list.getSelectionBackground());
       c.setForeground(list.getSelectionForeground());
     } else {
       c.setBackground(list.getBackground());
       c.setForeground(list.getForeground());
     }
     if (c instanceof JComponent) {
       ((JComponent) c).setOpaque(true);
     }
     return c;
   }
 }
 class StaticListModel implements ListModel {
   private final Object[] data = { "Hello", new Object(), new java.util.Date(),
       new JLabel("Hello world!"), this, };
   public Object getElementAt(int index) {
     return data[index];
   }
   public int getSize() {
     return data.length;
   }
   public void addListDataListener(ListDataListener ldl) {
   }
   public void removeListDataListener(ListDataListener ldl) {
   }
 }

}

      </source>
   
  
 
  

ListModel: getElementAt(int index)

   <source lang="java">

import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; public class MainClass {

 public static void main(final String args[]) {
   final String labels[] = { "A", "B", "C", "D", "E" };
   JFrame frame = new JFrame("Selecting JList");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JList jlist = new JList(labels);
   JScrollPane scrollPane1 = new JScrollPane(jlist);
   frame.add(scrollPane1);
   MouseListener mouseListener = new MouseAdapter() {
     public void mouseClicked(MouseEvent mouseEvent) {
       JList theList = (JList) mouseEvent.getSource();
       if (mouseEvent.getClickCount() == 2) {
         int index = theList.locationToIndex(mouseEvent.getPoint());
         if (index >= 0) {
           Object o = theList.getModel().getElementAt(index);
           System.out.println("Double-clicked on: " + o.toString());
         }
       }
     }
   };
   jlist.addMouseListener(mouseListener);
   frame.setSize(350, 200);
   frame.setVisible(true);
 }

}

      </source>