import  java.awt.BorderLayout;
 import  java.awt.Container;
 import  java.awt.event.ActionEvent;
 import  java.awt.event.ActionListener;

 import  javax.swing.JComboBox;
 import  javax.swing.JFrame;
 import  javax.swing.JScrollPane;
 import  javax.swing.JTextArea;

 public   class  EditComboBox {
   public   static   void  main(String args[]) {
    String labels[] = { "Chardonnay", "Sauvignon", "Riesling", "Cabernet",
        "Zinfandel", "Merlot", "Pinot Noir", "Sauvignon Blanc",
        "Syrah", "Gewurztraminer" };
    JFrame frame =  new  JFrame("Editable JComboBox");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

     final  JComboBox comboBox =  new  JComboBox(labels);
    comboBox.setMaximumRowCount( 5 );
    comboBox.setEditable(true);
    contentPane.add(comboBox, BorderLayout.NORTH);

     final  JTextArea textArea =  new  JTextArea();
    JScrollPane scrollPane =  new  JScrollPane(textArea);
    contentPane.add(scrollPane, BorderLayout.CENTER);

    ActionListener actionListener =  new  ActionListener() {
       public   void  actionPerformed(ActionEvent actionEvent) {
        textArea.append("Selected: " + comboBox.getSelectedItem());
        textArea.append(", Position: " + comboBox.getSelectedIndex());
        textArea.append(System.getProperty("line.separator"));
      }
    };
    comboBox.addActionListener(actionListener);

    frame.setSize( 300 ,  200 );
    frame.setVisible(true);
  }
}