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

public class Damier{

	public static void main(String[] args) {
		JFrame fenetre = new JFrame();
		fenetre.setSize(400, 400);
    	fenetre.setLocation(0, 0);
    	GridLayout grille = new GridLayout(5,5);
    	fenetre.setLayout(grille);
    	fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    	for (int i=0; i < 25; ++i){
    		JPanel panel = new JPanel();
    		panel.setBackground(i%2 == 0 ? Color.WHITE : Color.CYAN);
    		fenetre.add(panel);
    	} fenetre.setVisible(true);
	}
}