public boolean equals(Object obj) {
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Disciplina other = (Disciplina) obj;
		if (codigo == null) {
			if (other.codigo != null){
				return false;
		 	}  else {
		 		return true;
		 	}
		} else if (!codigo.equals(other.codigo)){
		 		return false;
		} else {
		 
		return true;
		}
	}