JCheckBox

      JCheckBox provides the functionality of a checkbox. Its immediate superclass is JToggleButton, which provides the support for two state button.

      One commonly used constructor for JCheckBox is:

JCheckBox(String str)

It creates a checkbox that has the text specified by str as a label.

      When a user selects or deselects a checkbox, an ItemEvent is generated. We can obtain a reference to the JCheckBox that generated the event by calling getItem() on the ItemEvent passed to the ItemStateChanged() method defined by ItemListener.

      The easiest way to determine the state of a checkbox is to call isSelected() on the JCheckBox instance.

      Example:

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class MyCheckBox extends JApplet implements ItemListener

{

  JLabel l1;

  public void init()

  {

   try

   {

    SwingUtilities.invokeAndWait(new Runnable() {

      public void run()

      {

          makeGUI();

      }

    });

  } catch(Exception e){

           System.out.println("Sorry some error occured "+e);

        }

 }

 private void makeGUI()

 {

   setLayout(new FlowLayout());

   l1=new JLabel("Select Language");

   JCheckBox cb=new JCheckBox ("C");

   cb.addItemListener(this);

   add(cb);

   cb=new JCheckBox ("C++");

   cb.addItemListener(this);

   add(cb);

   add(l1);

 }

 public void itemStateChanged(ItemEvent ie)

 {

   JCheckBox cb=(JCheckBox)ie.getItem();

   if(cb.isSelected())

     l1.setText(cb.getText() + " is selected");

   else

     l1.setText(cb.getText() + " is deselected");

 }

}

Output: