PropertyResourceBundle is a concrete subclass of
+ * ResourceBundle that manages resources for a locale
+ * using a set of static strings from a property file. See
+ * {@link ResourceBundle 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
+ * {@link ResourceBundle#getBundle(java.lang.String, java.util.Locale, java.lang.ClassLoader) 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
+ *
+ *
+ *
+ *
+ * Note: PropertyResourceBundle can be constructed either
+ * from an InputStream or a Reader, which represents a property file.
+ * Constructing a PropertyResourceBundle instance from an InputStream requires
+ * that the input stream be encoded in ISO-8859-1. In that case, characters
+ * that cannot be represented in ISO-8859-1 encoding must be represented by
+ * Unicode Escapes,
+ * whereas the other constructor which takes a Reader does not have that limitation.
+ *
+ * @see ResourceBundle
+ * @see ListResourceBundle
+ * @see Properties
+ * @since JDK1.1
+ */
+public class PropertyResourceBundle extends ResourceBundle {
+ /**
+ * Creates a property resource bundle from an {@link java.io.InputStream
+ * InputStream}. The property file read with this constructor
+ * must be encoded in ISO-8859-1.
+ *
+ * @param stream an InputStream that represents a property file
+ * to read from.
+ * @throws IOException if an I/O error occurs
+ * @throws NullPointerException if stream is null
+ */
+ public PropertyResourceBundle (InputStream stream) throws IOException {
+ Properties properties = new Properties();
+ properties.load(stream);
+ lookup = new HashMap(properties);
+ }
+
+ /**
+ * Creates a property resource bundle from a {@link java.io.Reader
+ * Reader}. Unlike the constructor
+ * {@link #PropertyResourceBundle(java.io.InputStream) PropertyResourceBundle(InputStream)},
+ * there is no limitation as to the encoding of the input property file.
+ *
+ * @param reader a Reader that represents a property file to
+ * read from.
+ * @throws IOException if an I/O error occurs
+ * @throws NullPointerException if reader is null
+ * @since 1.6
+ */
+ public PropertyResourceBundle (Reader reader) throws IOException {
+ Properties properties = new Properties();
+ properties.load(reader);
+ lookup = new HashMap(properties);
+ }
+
+ // Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification.
+ public Object handleGetObject(String key) {
+ if (key == null) {
+ throw new NullPointerException();
+ }
+ return lookup.get(key);
+ }
+
+ /**
+ * Returns an Enumeration of the keys contained in
+ * this ResourceBundle and its parent bundles.
+ *
+ * @return an Enumeration of the keys contained in
+ * this ResourceBundle and its parent bundles.
+ * @see #keySet()
+ */
+ public EnumerationSet of the keys contained
+ * only in this ResourceBundle.
+ *
+ * @return a Set of the keys contained only in this
+ * ResourceBundle
+ * @since 1.6
+ * @see #keySet()
+ */
+ protected Set