Program to demonstrate how to apply event handling mechanism to JCheckBox Swing Components :
package com.hubberspot.awtSwing.example; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CheckBoxItemListener implements ItemListener { JFrame frame; JCheckBox checkBoxArray[] = new JCheckBox[3]; JTextField textField; JLabel label; JPanel panel; CheckBoxItemListener() { frame = new JFrame("JCheckBox Event Handling"); frame.setLayout(new GridLayout(3,1)); panel = new JPanel(); checkBoxArray[0] = new JCheckBox("Java"); checkBoxArray[1] = new JCheckBox("C++"); checkBoxArray[2] = new JCheckBox("C"); for(int i = 0; i<3; i++) { panel.add(checkBoxArray[i]); checkBoxArray[i].addItemListener(this); } textField = new JTextField(20); label = new JLabel("Select the Programming " + "Language you have used : ", JLabel.CENTER); frame.add(label); frame.add(panel); frame.add(textField); frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void itemStateChanged(ItemEvent ie) { String message="You have used: "; for(int i=0; i<3; i++) { if(checkBoxArray[i].isSelected()) message += checkBoxArray[i].getText() + " "; } textField.setText(message); } public static void main(String[] args) { new CheckBoxItemListener(); } }Output of the program :