import java.applet.Applet;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.util.Random;

class Kwadrat {

    private Color c;
    private int a;
    private int x,y;

    public Kwadrat(Dimension d) {
        Random gen = new Random();
        c = new Color(
                gen.nextFloat(),
                gen.nextFloat(),
                gen.nextFloat());

        int min_a = 10;
        int max_a = Math.min(d.width, d.height) / 3;
        a = min_a + gen.nextInt(max_a-min_a);

        x = gen.nextInt(d.width - a);
        y = gen.nextInt(d.height - a);
    }

    public void rysuj(Graphics g) {
        g.setColor(Color.white);
        g.fillRect(x, y, a, a);
    }


}

public class jedna extends Applet {

    private Kwadrat[] tab;

    @Override
    public void init() {
        setBackground(Color.blue);
        Dimension d = getSize();
        final int N = 10;
        tab = new Kwadrat[N];
        for(int i = 0; i < N; i++)
            tab[i] = new Kwadrat(d);
    }

    @Override
    public void paint(Graphics g) {
        for(Kwadrat k : tab)
            k.rysuj(g);
    }

}