import javax.swing.*; import java.awt.event.*; public class Appl_1 extends JFrame { public Appl_1() { super("Titolo"); //Elementi dell'applicazione } public static void main(String[] args) { JFrame finestra = new Appl_1(); WindowListener wl = new WindowAdapter() {public void windowClosing(WindowEvent we) {System.exit(0);} }; finestra.addWindowListener(wl); finestra.setVisible(true); } }