@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (!(obj instanceof VertexListObject))
			return false;
		VertexListObject other = (VertexListObject) obj;
		if (vertex == null) {
			if (other.vertex != null)
				return false;
		} else if (!vertex.equals(other.vertex))
			return false;
		return true;
	}