HashMap<String, Vehiculo> hashMap = new HashMap<>();
        hashMap.put("1ABC", new Vehiculo("1ABC","fiat"));
        hashMap.put("2ABC", new Vehiculo("2ABC","fiat"));
        hashMap.put("3ABC", new Vehiculo("3ABC","mercedes"));
        hashMap.put("2ABC", new Vehiculo("2ABC","ferari"));

        Vehiculo vehiculo = hashMap.get("1ABC");

        boolean encontrado = hashMap.containsKey("1ABC");

        hashMap.remove("2ABC");


        //diccionario (mapa, clave-valor) -> conjunto (set, corral) -> tabla
        Iterator it = hashMap.entrySet().iterator();
        while (it.hasNext())
        {
            Map.Entry<String, Vehiculo> filaTabla = (Entry<String, Vehiculo>) it.next();
            System.out.println(filaTabla.getKey());//soy la clave
            System.out.println(filaTabla.getValue()); //soy el valor
        }