Implementar guardarEnfermera usando un java.util.Set
#7
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Se implementa el método
guardarEnfermeradel DAO usandojava.util.Set#add.java.util.Set#addnos devuelve si se agregó o no a la colección en la propia implementación del método por lo que no se necesita de ningúna otra comprobación para discriminar por duplicados.Se cambia de
HashSetaLinkedHashSetpara tener un acceso secuencial dentro de la colección