gistfile1.java

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

public class MonApplication {

	public static void main(String[] args) {
		MaFenetre f = new MaFenetre();
		f.afficher();
	}
}

class MaFenetre {

	JFrame mainFrame = null;

	public MaFenetre() {

		mainFrame = new JFrame();
		mainFrame.setTitle("Mon application");

		mainFrame.addWindowListener(new WindowAdapter() {

			class MonAutreClasse {
				
				class MegaTrucDeOuf {
					public void display(String message) {
						System.out.println(message);
					}
				}

				public void afficher(String message) {
					System.out.println(message);
				}

			}

			public void windowClosing(WindowEvent ev) {
				MonAutreClasse mac = new MonAutreClasse();
				mac.afficher("message");
				System.exit(0);
			}
		});

		mainFrame.setSize(320, 240);
	}

	public void afficher() {
		mainFrame.setVisible(true);
	}
}