@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Membership other = (Membership) obj;
		if (group == null) {
			if (other.group != null)
				return false;
		} else if (!group.equals(other.group))
			return false;
		
		if (member == null) {
			if (other.member != null)
				return false;
		} else if (!member.equals(other.member))
			return false;
		
		return true;
	}