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Java Standard Edition (SE)

PropertyResourceBundle


compact1, compact2, compact3
java.util

Class PropertyResourceBundle



  • public class PropertyResourceBundle
    extends ResourceBundle
    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
     

    The implementation of a PropertyResourceBundle subclass 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.

    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 as defined in section 3.3 of The Java™ Language Specification whereas the other constructor which takes a Reader does not have that limitation.

    Since:
    JDK1.1
    See Also:
    ResourceBundle, ListResourceBundle, Properties
    • Constructor Detail

      • PropertyResourceBundle

        public PropertyResourceBundle(InputStream stream)
                               throws IOException
        Creates a property resource bundle from an InputStream. The property file read with this constructor must be encoded in ISO-8859-1.
        Parameters:
        stream - an InputStream that represents a property file to read from.
        Throws:
        IOException - if an I/O error occurs
        NullPointerException - if stream is null
        IllegalArgumentException - if stream contains a malformed Unicode escape sequence.
    • Method Detail

      • handleGetObject

        public Object handleGetObject(String key)
        Description copied from class: ResourceBundle
        Gets 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:
        handleGetObject in class ResourceBundle
        Parameters:
        key - the key for the desired object
        Returns:
        the object for the given key, or null
      • getKeys

        public Enumeration<String> getKeys()
        Returns an Enumeration of the keys contained in this ResourceBundle and its parent bundles.
        Specified by:
        getKeys in class ResourceBundle
        Returns:
        an Enumeration of the keys contained in this ResourceBundle and its parent bundles.
        See Also:
        ResourceBundle.keySet()


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