gnu.java.util
Class DoubleEnumeration<T>
- Enumeration<E>
This is a helper class that combines two Enumerations.
It returns the elements of the first Enumeration until it has
no more elements and then returns the elements of the second
Enumeration.
In the default case:
doubleEnum = new DoubleEnumeration(enum1, enum2);
while (doubleEnum.hasMoreElements()) {
Object o = doubleEnum.nextElement();
do_something(o);
}
it calls hasMoreElements of the Enumerations as few times as
possible.
The references to the Enumerations are cleared as soon as they have no
more elements to help garbage collecting.
DoubleEnumeration(Enumeration e1, Enumeration e2)- Creates a new Enumeration combining the given two enumerations.
|
boolean | hasMoreElements()- Returns true, if at least one of the two enumerations has more
elements.
|
T | nextElement()- Returns the next element.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
DoubleEnumeration
public DoubleEnumeration(Enumeration e1,
Enumeration e2)
Creates a new Enumeration combining the given two enumerations.
The enumerations mustn't be accessed by other classes.
nextElement
public T nextElement()
Returns the next element. This returns the next element of the
first enumeration, if it has more elements, otherwise the next
element of the second enumeration. If both enumeration don't have
any elements it throws a NoSuchElementException.
- nextElement in interface Enumeration<E>
gnu.java.util.DoubleEnumeration
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