Java Reference
In-Depth Information
16-3. The MUD example of this chapter uses remote objects to represent the
rooms or places in the MUD and the people interacting in the MUD. Things
that appear in the MUD, however, are not remote objects; they are simply
part of the state of each room in the MUD.
Modify the example so that things are true remote objects. Define a
MudThing
interface that extends
Remote
. It should have a
getDescription()
method that returns the description of a thing. Modify the
MudPlace
interface
and
RemoteMudPlace
class to have methods that allow
MudThing
objects to
be added to and removed from a place.
Define a trivial implementation of
MudThing
that simply returns a static string
from its
getDescription()
method. Then, define another implementation of
MudThing
, named
Clock
. This class should have more dynamic behavior:
whenever its
getDescription()
method is called, it should return a string
that displays the current time. Modify the MUD server so that it places a
Clock
object in the entrance to the MUD.
16-4. Modify the MUD example again so that
MudPerson
objects can pick up
MudThing
objects they find in a
MudPlace
, carry them around, drop them in
other places, and give them to other people. Implement at least three new
methods:
pickup()
,
drop()
, and
give()
. Modify the MUD client so that it
supports pickup, drop, and give commands.
