Handle JCheckBox Events with an ItemListener in Java

Here, we have used ItemListener to handle JCheckBox events i.e. whenever any of the CheckBox is selected.

For example; When any of the sports like Football CheckBox is checked, event is fired and a message is visible in the botton.

The following is an example to handle JCheckBox events with an ItemListener:

Example

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo {    private JFrame mainFrame;    private JLabel headerLabel;    private JLabel statusLabel;    private JPanel controlPanel;    public SwingDemo(){       prepareGUI();    }    public static void main(String[] args){       SwingDemo swingControlDemo = new SwingDemo();       swingControlDemo.showCheckBoxDemo();    }    private void prepareGUI(){       mainFrame = new JFrame("Java Swing");       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("Favourite Sports");       final JCheckBox checkBox1 = new JCheckBox("Football");       final JCheckBox checkBox2 = new JCheckBox("Tennis");       final JCheckBox checkBox3 = new JCheckBox("Rugby");       final JCheckBox checkBox4 = new JCheckBox("Cricket");       final JCheckBox checkBox5 = new JCheckBox("Racing");       checkBox1.setMnemonic(KeyEvent.VK_F);       checkBox2.setMnemonic(KeyEvent.VK_T);       checkBox3.setMnemonic(KeyEvent.VK_R);       checkBox4.setMnemonic(KeyEvent.VK_C);       checkBox5.setMnemonic(KeyEvent.VK_A);       checkBox1.addItemListener(new ItemListener() {          public void itemStateChanged(ItemEvent e) {             statusLabel.setText("Football Checkbox: " + (e.getStateChange()==1?"checked":"unchecked"));          }       });       checkBox2.addItemListener(new ItemListener() {          public void itemStateChanged(ItemEvent e) {             statusLabel.setText("Tennis Checkbox: " + (e.getStateChange()==1?"checked":"unchecked"));          }       });       checkBox3.addItemListener(new ItemListener() {          public void itemStateChanged(ItemEvent e) {             statusLabel.setText("Rugby Checkbox is "+ (e.getStateChange()==1?"checked":"unchecked"));          }       });       checkBox4.addItemListener(new ItemListener() {          public void itemStateChanged(ItemEvent e) {             statusLabel.setText("Cricket Checkbox is " + (e.getStateChange()==1?"checked":"unchecked"));          }       });       checkBox5.addItemListener(new ItemListener() {          public void itemStateChanged(ItemEvent e) {             statusLabel.setText("Racing Checkbox is "+ (e.getStateChange()==1?"checked":"unchecked"));          }       });       controlPanel.add(checkBox1);       controlPanel.add(checkBox2);       controlPanel.add(checkBox3);       controlPanel.add(checkBox4);       controlPanel.add(checkBox5);       mainFrame.setVisible(true);    } }

The output is as follows displaying the frame:

Now, select any of the checkbox and the status would be visible in the bottom

Now, uncheck any of the checkbox and the status would be visible in the bottom: