Java program to demonstrate JCheckbox.

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.showCheckBoxDemo();
   }
   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 showCheckBoxDemo(){
      headerLabel.setText("Control in action: CheckBox");

      final JCheckBox chkApple = new JCheckBox("Apple");
      final JCheckBox chkMango = new JCheckBox("Mango");
      final JCheckBox chkPeer = new JCheckBox("Peer");

      chkApple.setMnemonic(KeyEvent.VK_C);
      chkMango.setMnemonic(KeyEvent.VK_M);
      chkPeer.setMnemonic(KeyEvent.VK_P);

      chkApple.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {        
            statusLabel.setText("Apple Checkbox: "
               + (e.getStateChange()==1?"checked":"unchecked"));
         }          
      });
      chkMango.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {            
            statusLabel.setText("Mango Checkbox: "
               + (e.getStateChange()==1?"checked":"unchecked"));
         }          
      });
      chkPeer.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {            
            statusLabel.setText("Peer Checkbox: "
               + (e.getStateChange()==1?"checked":"unchecked"));
         }          
      });
      controlPanel.add(chkApple);
      controlPanel.add(chkMango);
      controlPanel.add(chkPeer);      

      mainFrame.setVisible(true); 
   }
}