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

       + PROPERTY_FILE + "\n"
       + "for " + className);
      */
    } else {        
      try {
        Enumeration enm = typeOptions.keys();
        while (enm.hasMoreElements()) {
          String root = (String) enm.nextElement();
          String typeOption = (String) typeOptions.get(root);
          HierarchyPropertyParser hpp = new HierarchyPropertyParser();
          hpp.build(typeOption, ", ");
    hpps.put(root, hpp);
        }

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      return;
    }  
    
    Hashtable hpps = getClassesFromProperties();
    HierarchyPropertyParser hpp = null;
    Enumeration enm = hpps.elements();
    
    try{
      while (enm.hasMoreElements()) {
        hpp = (HierarchyPropertyParser) enm.nextElement(); 
        if(hpp.depth() > 0) {    
          hpp.goToRoot();
          while(!hpp.isLeafReached())
            hpp.goToChild(0);

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   * @param hpps the hierarchy of objects to mirror in the tree
   * @return a JTree representation of the hierarchy
   */
  protected JTree createTree(Hashtable hpps) {
    GOETreeNode             superRoot;
    Enumeration             enm;
    HierarchyPropertyParser hpp;
    
    if (hpps.size() > 1)
      superRoot = new GOETreeNode("root");
    else
      superRoot = null;


    enm = hpps.elements();
    while (enm.hasMoreElements()) {
      hpp = (HierarchyPropertyParser) enm.nextElement();
      hpp.goToRoot();
      GOETreeNode root = new GOETreeNode(hpp.getValue());
      addChildrenToTree(root, hpp);
      
      if (superRoot == null)

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    else {
      m_ZeroR = null;
    }
    
    // for each attribute ...
    Enumeration enu = instances.enumerateAttributes();
    while (enu.hasMoreElements()) {
      try {
  OneRRule r = newRule((Attribute) enu.nextElement(), data);


  // if this attribute is the best so far, replace the rule
  if (noRule || r.m_correct > m_rule.m_correct) {
    m_rule = r;
  }

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    // ... create arrays to hold the counts
    int[][] counts = new int [attr.numValues()]
                             [data.classAttribute().numValues()];
      
    // ... calculate the counts
    Enumeration enu = data.enumerateInstances();
    while (enu.hasMoreElements()) {
      Instance i = (Instance) enu.nextElement();
      if (i.isMissing(attr)) {
  missingValueCounts[(int) i.classValue()]++; 
      } else {
  counts[(int) i.value(attr)][(int) i.classValue()]++;
      }

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   *
   * @return     an enumeration of all the available options.
   */
  public Enumeration listOptions() {
    Vector result = new Vector();
    Enumeration enm = super.listOptions();
    while (enm.hasMoreElements())
      result.add(enm.nextElement());


    result.addElement(new Option(
        "\tA filter to apply (can be specified multiple times).",
        "F", 1, "-F <classname [options]>"));

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   *
   * @return an enumeration of all the available options.
   */
  public Enumeration listOptions(){
    Vector          result;
    Enumeration     enm;


    result = new Vector();


    enm = super.listOptions();
    while (enm.hasMoreElements())
      result.addElement(enm.nextElement());


    result.addElement(new Option(
  "\tThe file containing the serialized model.\n"
  + "\t(required)",
  "model", 1, "-model <filename>"));

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     * 
     * @return String[] of file extensions
     */
    public String[] extensions() {
        String[] ext = new String[fileTypes.size()];
        Enumeration e = fileTypes.elements();
        int i = 0;
        while (e.hasMoreElements()) {
            ext[i++] = (String)e.nextElement();
        }
        return ext;
    }

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   * @return enumeration of all the attribute's values
   */
  public final /*@ pure @*/ Enumeration enumerateValues() {


    if (isNominal() || isString()) {
      final Enumeration ee = new WekaEnumeration(m_Values);
      return new Enumeration () {
          public boolean hasMoreElements() {
            return ee.hasMoreElements();
          }
          public Object nextElement() {
            Object oo = ee.nextElement();
            if (oo instanceof SerializedObject) {
              return ((SerializedObject)oo).getObject();
            } else {
              return oo;
            }

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    text.append(ARFF_ATTRIBUTE).append(" ").append(Utils.quote(m_Name)).append(" ");
    switch (m_Type) {
    case NOMINAL:
      text.append('{');
      Enumeration enu = enumerateValues();
      while (enu.hasMoreElements()) {
  text.append(Utils.quote((String) enu.nextElement()));
  if (enu.hasMoreElements())
    text.append(',');
      }
      text.append('}');
      break;
    case NUMERIC:
      text.append(ARFF_ATTRIBUTE_NUMERIC);
      break;
    case STRING:
      text.append(ARFF_ATTRIBUTE_STRING);
      break;
    case DATE:
      text.append(ARFF_ATTRIBUTE_DATE).append(" ").append(Utils.quote(m_DateFormat.toPattern()));
      break;
    case RELATIONAL:
      text.append(ARFF_ATTRIBUTE_RELATIONAL).append("\n");
      Enumeration enm = m_Header.enumerateAttributes();
      while (enm.hasMoreElements()) {
        text.append(enm.nextElement()).append("\n");
      }
      text.append(ARFF_END_SUBRELATION).append(" ").append(Utils.quote(m_Name));
      break;
    default:
      text.append("UNKNOWN");

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