package jdriverdemo;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.io.*;public class MainFrame extends JFrame {  private JPanel contentPane;  private BorderLayout borderLayout1 = new BorderLayout();  private JComboBox drivers ;  //Construct the frame  public MainFrame() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception  {    File[] dvs = File.listRoots();    String[] names = new String[dvs.length];    System.out.println(dvs.length);    for (int i=0;i<dvs.length;i++){      names[i]=dvs[i].getName();    }    drivers = new JComboBox(names);    //setIconImage(Toolkit.getDefaultToolkit().createImage(MainFrame.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    contentPane.setLayout(borderLayout1);    this.setSize(new Dimension(394, 53));    this.setTitle("JDriverDemo");    drivers.setAutoscrolls(true);    drivers.setDoubleBuffered(true);    contentPane.add(drivers, BorderLayout.CENTER);  }  //Overridden so we can exit when window is closed  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }}