Examples of java.util.Enumeration

java.util.Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to the nextElement method return successive elements of the series.
For example, to print all elements of a Vector<E> v:
```
 for (Enumeration<E> e = v.elements(); e.hasMoreElements();) System.out.println(e.nextElement());
```
Methods are provided to enumerate through the elements of a vector, the keys of a hashtable, and the values in a hashtable. Enumerations are also used to specify the input streams to a SequenceInputStream.
NOTE: The functionality of this interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration. @see java.util.Iterator @see java.io.SequenceInputStream @see java.util.Enumeration#nextElement() @see java.util.Hashtable @see java.util.Hashtable#elements() @see java.util.Hashtable#keys() @see java.util.Vector @see java.util.Vector#elements() @author Lee Boynton @version 1.24, 11/17/05 @since JDK1.0

     *            declarations.
     */    
    private void writeNSDecls ()
        throws SAXException
    {
        Enumeration prefixes = nsSupport.getDeclaredPrefixes();
        while (prefixes.hasMoreElements()) {
            String prefix = (String) prefixes.nextElement();
            String uri = nsSupport.getURI(prefix);
            if (uri == null) {
                uri = "";
            }
            char ch[] = uri.toCharArray();

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     * This method is used on the root element to ensure that
     * the predeclared Namespaces all appear.
     */
    private void forceNSDecls ()
    {
        Enumeration prefixes = forcedDeclTable.keys();
        while (prefixes.hasMoreElements()) {
            String prefix = (String)prefixes.nextElement();
            doPrefix(prefix, null, true);
        }
    }

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      Group group = (Group) iterator.next();
      // Signed group (empty group that contains a signature)?
      if (group instanceof JSigned) {
        continue;
      }
      Enumeration e = group.members();
      while (e.hasMoreElements()) {
        Principal p = (Principal) e.nextElement();
        principalRoles.add(p.getName());
      }
    }
    return principalRoles.toArray();
  }

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            addAll = true;
        } else {
            searchStr = pattern.substring(0, globIndex);
        }


        Enumeration propNameEnum = props.propertyNames();
        while ( propNameEnum.hasMoreElements() ) {
            String name = (String) propNameEnum.nextElement();
            if ( name.startsWith(searchStr) || addAll ) {
                propNames.add(name);
            }
        }

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            addAll = true;
        } else {
            searchStr = filterPattern.substring(0, globIndex);
        }


        Enumeration propNameEnum = props.propertyNames();
        while ( propNameEnum.hasMoreElements() ) {
            String name = (String) propNameEnum.nextElement();
            if ( name.startsWith(searchStr)) {
              Object value = props.get(name);
              if (value != null) {
                results.put(name.substring(searchStr.length()), value);
              }

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     * object are added to the "addToThis" parameter.
     */
    public static void putAll(Properties addToThis,
                              Properties withThese) {
        if ( withThese != null && addToThis != null ) {
            Enumeration enumeration = withThese.propertyNames();
            while ( enumeration.hasMoreElements() ) {
                String propName = (String) enumeration.nextElement();
                Object propValue = withThese.get(propName);
                if ( propValue == null ) {
                    //defaults can only be retrieved as strings
                    propValue = withThese.getProperty(propName);
                }

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            }
        }
    }
    
    public static void setOverrideProperies(Properties base, Properties override) {
        Enumeration overrideEnum = override.propertyNames();
        while (overrideEnum.hasMoreElements()) {
            String key = (String)overrideEnum.nextElement();
            String value = base.getProperty(key);
            String overRideValue = override.getProperty(key);
            if (value != null && !value.equals(overRideValue)) {
                base.setProperty(key, overRideValue);
            }

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    }
    
    public static Properties sort(Properties props) {


        List names = new ArrayList();
        Enumeration enumeration = props.propertyNames();
        while ( enumeration.hasMoreElements() ) {
            String name = (String) enumeration.nextElement();
            names.add(name);
        }
        Collections.sort(names);


        Properties newProps = new Properties();

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        stream = new FileOutputStream(fileName);
          writer = new PrintStream(stream);
    
            List names = new ArrayList();
            Enumeration enumeration = props.propertyNames();
            while ( enumeration.hasMoreElements() ) {
                String name = (String) enumeration.nextElement();
                names.add(name);
            }
            Collections.sort(names);
    
            StringBuffer sb;

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    public static Collection sortPropertiesForPrinting(Properties props) {


        Collection sortedProps = new ArrayList(props.size());


        List names = new ArrayList();
        Enumeration enumeration = props.propertyNames();
        while ( enumeration.hasMoreElements() ) {
            String name = (String) enumeration.nextElement();
            names.add(name);
        }
        Collections.sort(names);


        StringBuffer sb;

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