import java.awt.*;
   import javax.swing.*;

   public class List extends JFrame {
     public static void main(String[] args) {
       List t = new List();
       ListModel bigData = new AbstractListModel() {
          public int getSize() { return Short.MAX_VALUE; }
          public Object getElementAt(int index) { return "Index " +
          index; }
        };

        JList bigDataList = new JList(bigData);

       //use the following method for performance reasons
       bigDataList.setPrototypeCellValue("Index 1234567890");
       JScrollPane js = new JScrollPane(bigDataList);
       t.getContentPane().add(js);
       t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       t.setVisible(true);
     }
   }