Package io.microsphere.collection

Class EmptyIterator<E>

  • Type Parameters:
    E - the type of elements returned by this iterator
    All Implemented Interfaces:
    java.util.Iterator<E>
    public class EmptyIterator<E>
extends java.lang.Object
implements java.util.Iterator<E>
    An empty and immutable implementation of the Iterator interface.

    This class provides a singleton instance through the public static field INSTANCE, which can be used directly without creating additional instances. It is safe for use in multi-threaded environments since it does not maintain any mutable state.

    Example Usage

    
 // Using the singleton instance
 Iterator<String> iterator = EmptyIterator.INSTANCE;

 // Iterating over the empty iterator
 while (iterator.hasNext()) {
     String next = iterator.next(); // Will never enter the loop
 }

 // Attempting to remove from the iterator will throw an exception
 try {
     iterator.remove();
 } catch (UnsupportedOperationException e) {
     System.out.println("Cannot modify an empty, immutable iterator.");
 }
    Author:
    Mercy
    See Also:
    Iterator, Collections.emptyIterator()

    • Constructor Summary

      Constructors 
      Constructor Description
      EmptyIterator()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean hasNext()  
      E next()  
      void remove()  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

      • Methods inherited from interface java.util.Iterator

        forEachRemaining

    • Constructor Detail

      • EmptyIterator

        public EmptyIterator()

    • Method Detail

      • hasNext

        public boolean hasNext()
        Specified by:
        hasNext in interface java.util.Iterator<E>

      • next

        public E next()
        Specified by:
        next in interface java.util.Iterator<E>

      • remove

        public void remove()
        Specified by:
        remove in interface java.util.Iterator<E>