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Interface collections.CollectionEnumeration

public interface interface CollectionEnumeration

extends Enumeration, Serializable

corrupted()

Return true if the collection that constructed this enumeration has been detectably modified since construction of this enumeration.

numberOfRemainingElements()

Return the number of elements in the enumeration that have not yet been traversed.

 public abstract boolean corrupted()

Return true if the collection that constructed this enumeration has been detectably modified since construction of this enumeration. Ability and precision of detection of this condition can vary across collection class implementations. hasMoreElements() is false whenever corrupted is true.

Returns:

true if detectably corrupted.

 public abstract int numberOfRemainingElements()

Return the number of elements in the enumeration that have not yet been traversed. When corrupted() is true, this number may (or may not) be greater than zero even if hasMoreElements() is false. Exception recovery mechanics may be able to use this as an indication that recovery of some sort is warranted. However, it is not necessarily a foolproof indication.

You can also use it to pack enumerations into arrays. For example:

 Object arr[] = new Object[e.numberOfRemainingElement()]
 int i = 0;
 while (e.hasMoreElements()) arr[i++] = e.nextElement();
 

For the converse case,

Returns:

the number of untraversed elements

See Also:

ArrayEnumeration

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