Java tutorial
import java.awt.event.WindowEvent; 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) { WindowEvent newEvent = new WindowEvent(this, WindowEvent.WINDOW_ACTIVATED); 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); } }