Package io.microsphere.collection

Class SingletonEnumeration<E>

  • Type Parameters:
    E - The type of the element in this enumeration.
    All Implemented Interfaces:
    java.util.Enumeration<E>
    @Immutable
public class SingletonEnumeration<E>
extends java.lang.Object
implements java.util.Enumeration<E>
    A simple implementation of the Enumeration interface that contains a single element.

    This enumeration can only return the singleton element once, after which it will return false for subsequent calls to hasMoreElements() and throw a NoSuchElementException on subsequent calls to nextElement().

    Example Usage

    
 String item = "Hello";
 SingletonEnumeration<String> enumeration = new SingletonEnumeration<>(item);

 while (enumeration.hasMoreElements()) {
     System.out.println(enumeration.nextElement());
 }

    The output of the example would be:

     Hello
    Since:
    1.0.0
    Author:
    Mercy

    • Constructor Detail

      • SingletonEnumeration

        public SingletonEnumeration​(E element)

    • Method Detail

      • hasMoreElements

        public boolean hasMoreElements()
        Specified by:
        hasMoreElements in interface java.util.Enumeration<E>

      • nextElement

        public E nextElement()
        Specified by:
        nextElement in interface java.util.Enumeration<E>