Java Reference
In-Depth Information
returned. The default implementation in
ClassLoader
always
returns
null
.
public Enumeration<URL>
findResources(String name)
Returns an
Enumeration
of
URL
objects for all the resources of
the given name. The default implementation in
ClassLoader
re-
turns an enumeration through zero resources.
Here is a
findResource
for
PlayerLoader
:
public java.net.URL findResource(String name) {
File f = fileFor(name);
if (!f.exists())
return null;
try {
return f.toURL();
} catch (java.net.MalformedURLException e) {
return null; // shouldn't happen
}
}
The
fileFor
method is analogous to the
streamFor
method of
PlayerLoad-
er
. It returns a
java.io.File
object that corresponds to the named re-
source in the file system. If the named file actually exists, then the
URL
for the resource is created from the path. (The
File
class represents a
pathname in the file systemsee "
The File Class
"
on page
543
.
)
The
BoldPlayer
class might come with a
BoldPlayer.book
that can be found
in the same place as the class file. You can replace this version with your
own by simply placing yours in a location where it will be found first by
the system class loader or the bootstrap loader.
Exercise 16.12
: Modify your results for Exercise 16.11 to allow player
strategies to use attached resources by implementing
findResource
and
findResources
.
