Serializable Enumeration : Enumeration Interface « Collections « Java Tutorial

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Java Tutorial » Collections » Enumeration Interface 
9.35.12.Serializable EnumerationPrevious/Next
/*
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  * Copyright 2005, JBoss Inc., and individual contributors as indicated
  * by the @authors tag. See the copyright.txt in the distribution for a
  * full listing of individual contributors.
  *
  * This is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
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  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * Lesser General Public License for more details.
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  * License along with this software; if not, write to the Free
  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.NoSuchElementException;

/**
 * ???
 *      
 @author ???
 @version $Revision: 2800 $
 */
@SuppressWarnings("unchecked")
public class SerializableEnumeration
   extends ArrayList
   implements Enumeration
{
   /** The serialVersionUID */
   private static final long serialVersionUID = 8678951571196067510L;
   private int index;

   public SerializableEnumeration () {
      index = 0;
   }

   public SerializableEnumeration (Collection c) {
      super(c);
      index = 0;
   }
   
   public SerializableEnumeration (int initialCapacity) {
      super(initialCapacity);
      index = 0;
   }
   
   public boolean hasMoreElements() {
      return (index < size());
   }
  
   public Object nextElement() throws NoSuchElementException
   {
      try {
         Object nextObj = get(index);
         index++;
         return nextObj;
      }
      catch (IndexOutOfBoundsException e) {
         throw new NoSuchElementException();
      }
   }

   private void writeObject(java.io.ObjectOutputStream out)
      throws java.io.IOException
   {
      // the only thing to write is the index field
      out.defaultWriteObject();
   }
   
   private void readObject(java.io.ObjectInputStream in)
      throws java.io.IOException, ClassNotFoundException
   {
      in.defaultReadObject();
   }
}
9.35.Enumeration Interface
9.35.1.The Enumeration Interface
9.35.2.If you prefer a for-loop
9.35.3.Where do we get the enumeration from?
9.35.4.The SequenceInputStream Class
9.35.5.Concatenates the content of two enumerations into one.
9.35.6.Filters enumeration to contain each of the provided elements just once.
9.35.7.Filters some elements out from the input enumeration.
9.35.8.For each element of the input enumeration asks the Processor to provide a replacement
9.35.9.Removes all nulls from the input enumeration.
9.35.10.Returns an enumeration that iterates over provided array.
9.35.11.Support for breadth-first enumerating.
9.35.12.Serializable Enumeration
9.35.13.An enumeration that iterates over an array.
9.35.14.Creating Custom Enumerations
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