import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.util.ArrayList;

public class Fenetre {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Fenetre");
        JPanel panel = new JPanel();
        panel.setPreferredSize(new Dimension(800, 400));
        panel.setBackground(new Color(200, 200, 200));
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}