public abstract class Figur {
    public Figur(int x, int y) {
        this.x_center = x;
        this.y_center = y;
    } // Figur

    public abstract int max_x();
    public abstract int max_y();
    public abstract int area();
    public abstract int omkrets();

    protected int x_center, y_center;
} // class Figur