To Demonstrate the Simple Array Iterator

Here is a Java Program to Demonstrate the Simple Array Iterator.

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Iterator that works over an array of Objects
 * Use it: Iterator iter = new ArrayIterator( myArray );
 *
 */
class SimpleArrayIterator implements Iterator{

   /**
    * True if we are debugging, includes main
    * test driver code.
    */
   static final boolean debugging = true;

   /**
    * Reference to the original array we will
    * iterate over. Not a copy of the array.
    */
   Object[] array;

   /**
    * How far down the array we have iterated so far.
    */
   int pos;

   /**
    * public constructor
    *
    * @param a The array we are to iterate over. It must
    * be an array of Objects of some sort not
    * int[] etc.
    */
 public SimpleArrayIterator( Object[] a ){
  array = a;
  pos = 0;
    }

   /**
    * Is there yet another element in the array
    * to go?
    *
    * @return true if there are more elements
    */
 public boolean hasNext(){
  return( pos < array.length );
    }

   /**
    * Get the next element of the array.
    *
    * @return Next element of a the array. You must cast
    * it back to its proper type from Object.
    * @exception NoSuchElementException
    */
   public Object next() throws NoSuchElementException{
      if ( pos >= array.length )
         throw new NoSuchElementException();

      return array[pos++];
   }

   /**
    * Remove the current object from the array.
    * Not implemented.
    *
    * @exception UnsupportedOperationException
    * @exception IllegalStateException
    */
   public void remove() throws UnsupportedOperationException , IllegalStateException {
      throw new UnsupportedOperationException();
   }

  
   public static void main ( String[] args ) {
      if ( debugging ) {
         String[] fruits = new String [] { "apple" , "orange" , "apricot"};
         for ( Iterator iter = new SimpleArrayIterator( fruits ); iter.hasNext(); ) {
            String key = (String) iter.next();
            System.out.println( key );
            }
         }
      }
   }

Output of Above Java Program
apple
orange
apricot