import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;
 
public class ComboExample extends JFrame implements  
			ItemListener { 

  private JComboBox  comboNumbers;

  private  String names [] = { "1", "2", "3"};
  private JPanel pnlData;
 
  public ComboExample() { 
     setSize(450, 275);
 
     comboNumbers = new JComboBox(names); 
     comboNumbers.addItemListener(this); 

     pnlData = new JPanel();
     pnlData.add(comboNumbers);



     Container c = getContentPane();      
     c.add(pnlData, BorderLayout.NORTH);

 
     setVisible(true); 
  }       
      
  
  // item listener event 
  public void itemStateChanged(ItemEvent e) { 
     String s = (String)e.getItem();
     System.out.println(s); 
  } 
  
          
public static void main( String []args) {

ComboExample c = new ComboExample();
}

}