Обработка открытия и закрытия окна

frame.addWindowListener(new WindowAdapter() {

   @Override

   public void windowClosing(WindowEvent e) {

       System.out.println("Закрылось окно");

   }

   @Override

   public void windowOpened(WindowEvent e) {

       System.out.println("Отрылось окно");

   }

});

import javax.swing.*;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import java.io.File;

import java.io.FileWriter;

import java.util.Scanner;

public class Main {

   public static void main(String[] args) {

       JFrame window = new JFrame("Мое окно");

       window.setLayout(null);

       window.addWindowListener(new WindowAdapter() {

           @Override

           public void windowOpened(WindowEvent e) {

               try {

                   File file = new File("settings.txt");

                   Scanner scanner = new Scanner(file);

                   int w = scanner.nextInt();

                   int h = scanner.nextInt();

                   window.setSize(w, h);

               } catch (Exception ex) {

                   System.err.println("Ошибка!");

               }

           }

           @Override

           public void windowClosing(WindowEvent e) {

               try {

                   File file = new File("settings.txt");

                   FileWriter writer = new FileWriter(file);

                   writer.write(window.getWidth() + " " + window.getHeight());

                   writer.close();

               } catch (Exception ex) {

                   System.err.println("Ошибка!");

               }

           }

       });

       window.setVisible(true);

   }

}