Andrews SCJD book. Is this an error in source code?

[Yucca Nel]

/**
* A structure that keeps track of the locked Dvd records. Note that we
* have not made this static, as doing so would mean that only one set
* of reservations could exist at any given time. We rely on the class
* which uses this ReservationManager to ensure that only one instance
* exists for any reservations.
*/
private static Map<String, DvdDatabase> reservations
= new HashMap<String, DvdDatabase>();


He says that it is not static. Yet it is? Is it meant to be static or not? I would guess static is what we are going for?

[Yucca Nel]

No one can answer this?

[Roel De Nijs]

I believe it's meant not to be static, like said in the comment.

in DvdDatabase there is following code:

  
    /**
     * A static structure that keeps track of the locked Dvd records.
     */
    private static ReservationsManager reservationsManager
            = new ReservationsManager();

Here it's static, so just one instance of ReservationsManager and thus also from the reservations-map. so no static is needed in front of the reservations-map.