import javax.swing.*;
import java.awt.*;

public class Ex4
{
    public static void main(String[] args) 
    {

        JFrame fenetre = new JFrame();

        fenetre.setSize(500, 500);
        fenetre.setMinimumSize(new Dimension(500, 500));
        fenetre.setLocation(100, 100);
        fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        GridLayout layout = new GridLayout(5, 5);
        fenetre.setLayout(layout);

        int green = 0;

        for (int i = 0; i < 5; i++)
        {
            int blue = 0;
            green += 51;
            for (int j = 0; j < 5; j++)
            {
                blue += 51;
                fenetre.add(new Cercle(new Color(0, green, blue)));
            }
        }

        fenetre.setVisible(true);
    }
}