PropertyResourceBundle is a concrete subclass of
ResourceBundle that manages resources for a locale
using a set of static strings from a property file. See
ResourceBundle for more information about resource
bundles.
Unlike other types of resource bundle, you don't subclass
PropertyResourceBundle. Instead, you supply properties
files containing the resource data. ResourceBundle.getBundle
will automatically look for the appropriate properties file and create a
PropertyResourceBundle that refers to it. See
ResourceBundle.getBundle
for a complete description of the search and instantiation strategy.
The following example shows a member of a resource
bundle family with the base name "MyResources".
The text defines the bundle "MyResources_de",
the German member of the bundle family.
This member is based on PropertyResourceBundle, and the text
therefore is the content of the file "MyResources_de.properties"
(a related example shows
how you can add bundles to this family that are implemented as subclasses
of ListResourceBundle).
The keys in this example are of the form "s1" etc. The actual
keys are entirely up to your choice, so long as they are the same as
the keys you use in your program to retrieve the objects from the bundle.
Keys are case-sensitive.
# MessageFormat pattern
s1=Die Platte \"{1}\" enthält {0}.
# location of {0} in pattern
s2=1
# sample disk name
s3=Meine Platte
# first ChoiceFormat choice
s4=keine Dateien
# second ChoiceFormat choice
s5=eine Datei
# third ChoiceFormat choice
s6={0,number} Dateien
# sample date
s7=3. März 1996
- API Note:
PropertyResourceBundlecan be constructed either from anInputStreamor aReader, which represents a property file. Constructing aPropertyResourceBundleinstance from anInputStreamrequires that the input stream be encoded inUTF-8. By default, if aMalformedInputExceptionor anUnmappableCharacterExceptionoccurs on reading the input stream, then thePropertyResourceBundleinstance resets to the state before the exception, re-reads the input stream inISO-8859-1, and continues reading. If the system propertyjava.util.PropertyResourceBundle.encodingis set to either "ISO-8859-1" or "UTF-8", the input stream is solely read in that encoding, and throws the exception if it encounters an invalid sequence. If "ISO-8859-1" is specified, characters that cannot be represented in ISO-8859-1 encoding must be represented by Unicode Escapes as defined in section 3.3 of The Java Language Specification whereas the other constructor which takes aReaderdoes not have that limitation. Other encoding values are ignored for this system property. The system property is read and evaluated when initializing this class. Changing or removing the property has no effect after the initialization.- Implementation Requirements:
- The implementation of a
PropertyResourceBundlesubclass must be thread-safe if it's simultaneously used by multiple threads. The default implementations of the non-abstract methods in this class are thread-safe. - Since:
- 1.1
- See Also:
-
Nested Class Summary
Nested classes/interfaces declared in class java.util.ResourceBundle
ResourceBundle.Control -
Field Summary
Fields declared in class java.util.ResourceBundle
parent -
Constructor Summary
ConstructorsConstructorDescriptionPropertyResourceBundle(InputStream stream) Creates a property resource bundle from anInputStream.PropertyResourceBundle(Reader reader) Creates a property resource bundle from aReader. -
Method Summary
Modifier and TypeMethodDescriptiongetKeys()Returns anEnumerationof the keys contained in thisResourceBundleand its parent bundles.handleGetObject(String key) Gets an object for the given key from this resource bundle.Returns aSetof the keys contained only in thisResourceBundle.Methods declared in class java.util.ResourceBundle
clearCache, clearCache, containsKey, getBaseBundleName, getBundle, getBundle, getBundle, getBundle, getBundle, getBundle, getBundle, getBundle, getLocale, getObject, getString, getStringArray, keySet, setParent
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Constructor Details
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PropertyResourceBundle
Creates a property resource bundle from anInputStream. This constructor reads the property file in UTF-8 by default. If aMalformedInputExceptionor anUnmappableCharacterExceptionoccurs on reading the input stream, then the PropertyResourceBundle instance resets to the state before the exception, re-reads the input stream inISO-8859-1and continues reading. If the system propertyjava.util.PropertyResourceBundle.encodingis set to either "ISO-8859-1" or "UTF-8", the input stream is solely read in that encoding, and throws the exception if it encounters an invalid sequence. Other encoding values are ignored for this system property. The system property is read and evaluated when initializing this class. Changing or removing the property has no effect after the initialization.- Parameters:
stream- an InputStream that represents a property file to read from.- Throws:
IOException- if an I/O error occursNullPointerException- ifstreamis nullIllegalArgumentException- ifstreamcontains a malformed Unicode escape sequence.MalformedInputException- if the system propertyjava.util.PropertyResourceBundle.encodingis set to "UTF-8" andstreamcontains an invalid UTF-8 byte sequence.UnmappableCharacterException- if the system propertyjava.util.PropertyResourceBundle.encodingis set to "UTF-8" andstreamcontains an unmappable UTF-8 byte sequence.
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PropertyResourceBundle
Creates a property resource bundle from aReader. Unlike the constructorPropertyResourceBundle(InputStream), there is no limitation as to the encoding of the input property file.- Parameters:
reader- a Reader that represents a property file to read from.- Throws:
IOException- if an I/O error occursNullPointerException- ifreaderis nullIllegalArgumentException- if a malformed Unicode escape sequence appears fromreader.- Since:
- 1.6
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Method Details
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handleGetObject
Description copied from class:ResourceBundleGets an object for the given key from this resource bundle. Returns null if this resource bundle does not contain an object for the given key.- Specified by:
handleGetObjectin classResourceBundle- Parameters:
key- the key for the desired object- Returns:
- the object for the given key, or null
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getKeys
Returns anEnumerationof the keys contained in thisResourceBundleand its parent bundles.- Specified by:
getKeysin classResourceBundle- Returns:
- an
Enumerationof the keys contained in thisResourceBundleand its parent bundles. - See Also:
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handleKeySet
Returns aSetof the keys contained only in thisResourceBundle.- Overrides:
handleKeySetin classResourceBundle- Returns:
- a
Setof the keys contained only in thisResourceBundle - Since:
- 1.6
- See Also:
-