Java by API/javax.swing/ListModel

implements ListModel

//
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) {
    }
  }
}

ListModel: getElementAt(int index)

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);
  }
}