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# Conxuntos: Set e HashSet

1. Implementa unha clase GrupoAlumnos que represente o alumnado dos grupos de primeiro de  DAW A e DAW B. O grupo de alumnos debe de implementar as seguintes métodos:
   1. **engadir():** Engade un alumno ao grupo. Non debe permitir duplicados
   2. **eliminar():** Elimina un alumno do grupo. Se non existe, non fai nada
   3. **contains():** Devolve certo se o alumno pertence o grupo
   4. **union()**: Devolve un novo grupo de alumnos coa union dos dous grupos
   5. **interseccion():** Devolve un novo grupo de alumnos coa unión dos dous grupos
   6. Implementa outra clase App que conteña o main, na que, a partir das seguintes listas, se poidan crear os grupos e probar as funcionaliades. 

```java
List<String> listaA = Arrays.asList("Ana", "Carlos", "Marta", "Xoan");
List<String> listaB = Arrays.asList("María", "Jorge", "Lucía", "David");
```

{% hint style="warning" %}
Revisa os constructores das clases de conxuntos. As clases que implementan as interfaces de Collection, adoita a ter **un constructor que recibe unha colección de calqueira tipo e crea a clase para o tipo correspondente.**&#x20;
{% endhint %}


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