> For the complete documentation index, see [llms.txt](https://educacion.gitbook.io/programacion/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://educacion.gitbook.io/programacion/ud4-elementos-da-programacion-orientada-a-obxectos/uml-linguaxe-de-modelado-unificada/relacions-entre-clases-herdanza.md).

# Relacións entre clases: Herdanza

O diagrama de clases UML permite representar as relacións entre as diferentes clases que compoñen un dominio concreto.

### Herdanza

A herdanza vai a quedar representada da seguinte forma:

{% @mermaid/diagram content="classDiagram
direction TB  %% TB = Top to Bottom (de arriba a abaixo)

```
%% Clase Persoa - Exemplo completo con visibilidade
class Persoa {
    -id: int = 0
    -nome: String
    -idade: int
    #contadorInstancias: static int
    +Persoa(nome: String, idade: int)
    +getNome() String
    +setNome(nome: String) void
    +calcularAnoNacemento() int
    +getContador()$ static int
}

%% Clase Estudante que herda de Persoa
class Estudante {
    -numeroMatricula: String
    -notaMedia: double
    +Estudante(nome: String, idade: int, matricula: String)
    +estudiar() void
    +getMatricula() String
}

%% Relación de herdanza (Persoa arriba, Estudante abaixo)
Persoa <|-- Estudante : Herdanza



```

" %}

{% hint style="warning" %}
Para facilitar unha maior claridade, os métodos que son **herdados e sobrescritos**, incluiranse no UML da clase fillo.

Os métodos que son **unicamente heredados** (definidos na clase pai), no se incluirán no UML da clase fillo
{% endhint %}


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