Enumeration interface

[Vijay pillai]

thks for the ans this was very useful.
if someone could tell me which class in the API directly implements Enumeration.
thks
VIJAY PILLAI

[Manfred Leonhardt]

From reading another of your posts, I gather that you are confused about the Enumeration interface issue. I will try and clear it up for you.
By stating that a class implements the Enumeration interface we are telling all class users that we have the following routines implemented:
boolean hasMoreElements();
Object getNextElement();
A few collections (i.e., Vector, Hashtable) have 'default' (accessible only from within java.util package) classes that implement the Enumeration interface.
Lets use the Vector class as an example:

public class Vector implements Cloneable, java.io.Serializable
{
  public Enumeration getElements()
  {
    return( new VectorEnumeration( this ) );
  }
}
final class VectorEnumerator implements Enumeration
{
  boolean hasMoreElements()
  {
  }
  Object getNextElement()
  {
  }
}

The above code provides the means to make use of the following code:

Enumeration e = myVector.elements();
while( e.hasMoreElements() )
{
  System.out.println( e.getNextElement() );
}

Manfred.
[This message has been edited by Manfred Leonhardt (edited January 11, 2001).]