Java in a Nutshell, 5th Edition [Electronic resources] نسخه متنی

This interface defines the methods
necessary to enumerate, or iterate, through a set of values, such as
the set of values contained in a hashtable. This interface is
superseded in Java 1.2 by the Iterator inteface.
In Java 5.0 this interface has been made generic and defines the type
variable E to represent the type of the
objects being enumerated.

An Enumeration is usually not instantiated
directly, but instead is created by the object that is to have its
values enumerated. A number of classes, such as
Vector and Hashtable, have
methods that return Enumeration objects.

To use an
Enumeration object, you use its two methods in a
loop. hasMoreElements( ) returns
TRue if there are more values to be enumerated and
can determine whether a loop should continue. Within a loop, a call
to nextElement( ) returns a value from the
enumeration. An Enumeration makes no guarantees
about the order in which the values are returned. The values in an
Enumeration can be iterated through only once;
there is no way to reset it to the beginning.

public interface

Enumeration<E> {
// Public Instance Methods
boolean

hasMoreElements ( );
E

nextElement ( );
}

Implementations

StringTokenizer

Passed To

java.io.SequenceInputStream.SequenceInputStream(
), Collections.list( )

Returned By

Too many methods to list.