The Enumeration interface defines the methods by which you can enumerate
(obtain one at a time) the elements in a collection of objects.
This legacy interface has been superceded by Iterator. Although not
deprecated, Enumeration is considered obsolete for new code. However, it is
used by several methods defined by the legacy classes such as Vector and
Properties, is used by several other API classes, and is currently in
widespread use in application code.
The methods declared by Enumeration are summarized in the following
table:
|
SN
|
Methods with Description
|
|
1
|
boolean
hasMoreElements( )
When implemented, it must return true while there are still more elements to extract, and false when all the elements have been enumerated. |
|
2
|
Object
nextElement( )
This returns the next object in the enumeration as a generic Object reference. |
Example:
Following is the example showing usage of Enumeration.
import
java.util.Vector;
import
java.util.Enumeration;
public class
EnumerationTester {
public static void main(String args[]) {
Enumeration days;
Vector dayNames = new Vector();
dayNames.add("Sunday");
dayNames.add("Monday");
dayNames.add("Tuesday");
dayNames.add("Wednesday");
dayNames.add("Thursday");
dayNames.add("Friday");
dayNames.add("Saturday");
days = dayNames.elements();
while (days.hasMoreElements()){
System.out.println(days.nextElement());
}
}
}
This would produce following result:
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
