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ComboBox with ItemListener

import java.awt.BorderLayout; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; public class ComboBoxWithItemChangedListener extends JFrame {   public static void main(String[] args) {     ComboBoxWithItemChangedListener that = new ComboBoxWithItemChangedListener();     that.setVisible(true);   }   public ComboBoxWithItemChangedListener() {     setSize(450, 350);     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     getContentPane().add(new ComboPanel(), BorderLayout.SOUTH);   } } class ComboPanel extends JPanel {   final static String[] treasure = { "Gold", "Silver", "Diamonds", "Rubies", "Emeralds",       "Sapphires", "Chocolate" };   public ComboPanel() {     final JComboBox combo = new JComboBox(treasure);     combo.setMaximumRowCount(5);     combo.addItemListener(new ItemListener() {       public void itemStateChanged(ItemEvent e) {         System.out.println("Combo: " + combo.getSelectedItem());       }     });     combo.setSelectedIndex(4);     add(combo);   } }