public class Taller  {
    private HashMap <String, Cliente> clientes;
    private HashMap <String, Operario> operarios;
    private ArrayList <Visita> visitas;
}
public class Cliente {
    private String nif, nombre, telefono;
    private ArrayList <Visita> visitas;
}
public class Operario {
    private String nif, nombre, categoria;
    private ArrayList <Visita> visitas;

}
public class Visita {
    protected double importeFactura;
}
public class Averia extends Visita{
    private ArrayList <Detalle> detalles;
}
public class Revision extends Visita{
    private ArrayList <Detalle> detalles;
}
public class ITV extends Visita{
}
public class Fecha{
}
public class DetalleITV {
    private String comprobacion;
    private boolean pasada;
}
public class Detalle{
    private String descripcion, piezaCambiada;
}