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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:
Updated on: 30-Jul-2019
1K+ Views
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