Java Reference
In-Depth Information
24.2.2.
PropertyResourceBundle
PropertyResourceBundle
is a subclass of
ResourceBundle
that reads its list of
resources from a text property description. Instead of using an array of
key/resource pairs, the text contains key/resource pairs as lines of the
form
key=value
Both keys and values must be strings. A
PropertyResourceBundle
object
reads the text from an
InputStream
passed to the
PropertyResourceBundle
constructor and uses the information it reads to build a lookup table for
efficient access.
The bundle search process that we described earlier actually has an
additional step that looks for a file
ResName
.properties
after it looks
for a class
ResName
. For example, if the search process doesn't find
the class
GlobalRes_eo_KI_left
it will then look for the file
Glob-
alRes_eo_KI_left.properties
before looking for the next resources class.
If that file exists, an input stream is created for it and used to construct
a
PropertyResourceBundle
that will read the properties from the file.
It is easier to use property files than to create subclasses of
ListRe-
sourceBundle
but the files have two limitations. First, they can only define
string resources whereas
ListResourceBundle
can define arbitrary objects.
Second, the only legal character encoding for property files is the byte
format of
ISO
8859-1. This means that other Unicode characters must
be encoded with
\u
xxxx
escape sequences.
24.2.3. Subclassing
ResourceBundle
ListResourceBundle
,
PropertyResourceBundle
, and
.properties
files will be
sufficient for most of your bundles, but you can create your own sub-
