public class Window extends JFrame{

private static final long serialVersionUID = 1L;
private static final String NAME = "Macedonia";
private static final Color BG_COLOR = Color.DARK_GRAY;
private Figura f[];

public Window(){
    JFrame frame = new JFrame(NAME);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBackground(BG_COLOR);
    frame.setSize(100, 100);
    f = new Figura[30];
    for(int i=0; i<f.length; i++){

    }
    f[0] = new Figura(600, 500, BG_COLOR);
    f[0].setSizeOfRect(40, 40);
    f[0].setPosition(10, 10);
    f[0].setColor(Color.RED);

    f[1] = new Figura(600, 500, BG_COLOR);
    f[1].setSizeOfRect(40, 40);
    f[1].setPosition(60, 10);
    f[1].setColor(Color.BLUE);

    frame.add(f[0]);
    frame.add(f[1]);

    frame.pack();
    frame.setVisible(true);
}