Java tutorial
import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JCheckBox; import javax.swing.JFrame; public class Main extends JFrame { JCheckBox check = new JCheckBox("Checkbox", false); public Main() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); check.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { System.out.println("Checked? " + check.isSelected()); } }); getContentPane().add(check); pack(); setVisible(true); } public static void main(String arg[]) { new Main(); } }