JComboBox Example

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

public class SwingControlDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingControlDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();     
      swingControlDemo.showComboboxDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
     
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }       
      });   
      headerLabel = new JLabel("", JLabel.CENTER);       
      statusLabel = new JLabel("",JLabel.CENTER);   
      statusLabel.setSize(350,100);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true); 
   }
   private void showComboboxDemo(){                                   
      headerLabel.setText("Control in action: JComboBox");
      final DefaultComboBoxModel fruitsName = new DefaultComboBoxModel();

      fruitsName.addElement("Apple");
      fruitsName.addElement("Grapes");
      fruitsName.addElement("Mango");
      fruitsName.addElement("Peer");

      final JComboBox fruitCombo = new JComboBox(fruitsName);   
      fruitCombo.setSelectedIndex(0);

      JScrollPane fruitListScrollPane = new JScrollPane(fruitCombo);   
      JButton showButton = new JButton("Show");

      showButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            String data = "";
            if (fruitCombo.getSelectedIndex() != -1) {                    
               data = "Fruits Selected: "
                  + fruitCombo.getItemAt
                  (fruitCombo.getSelectedIndex());            
            }             
            statusLabel.setText(data);
         }
      });
      controlPanel.add(fruitListScrollPane);         
      controlPanel.add(showButton);   
      mainFrame.setVisible(true);            
   }
}