WindowEvent.WINDOW_ICONIFIED has the following syntax.
public static final int WINDOW_ICONIFIED
In the following code shows how to use WindowEvent.WINDOW_ICONIFIED field.
import java.awt.event.WindowEvent; //from w w w.ja v a 2 s. co m import javax.swing.JFrame; public class Main extends JFrame { public Main() { setDefaultCloseOperation(EXIT_ON_CLOSE); enableEvents(java.awt.AWTEvent.WINDOW_EVENT_MASK); } protected void processWindowEvent(WindowEvent e) { if (e.getID() == WindowEvent.WINDOW_ICONIFIED) { System.out.println(WindowEvent.WINDOW_ICONIFIED); dispose(); System.exit(0); } super.processWindowEvent(e); // Pass on the event } public static void main(String[] a) { Main window = new Main(); window.setBounds(30, 30, 300, 300); window.setVisible(true); } }