@@ -0,0 +1,634 @@
+public class Node %7B%0A    public Point point;%0A    public double thickness;%0A    public double sectorialArea = 0.0;%0A    public ArrayList%3CNode%3E links = null;%0A    public Node parent = null;%0A%0A    public Node(Point point, double thickness) %7B%0A        this.point = point;%0A        this.thickness = thickness;%0A    %7D%0A%0A    public Node(Point point) %7B%0A        this(point, 1.0);%0A    %7D%0A%0A    public void connect(Node node) %7B%0A        throw new NotImplementedException();%0A    %7D%0A%0A    public void disconnect(Node node) %7B%0A        throw new NotImplementedException();%0A    %7D%0A%0A    public String toString() %7B%0A        throw new NotImplementedException();%0A    %7D%0A%7D%0A

add Node class