Array Iterator : Iterator « Collections Data Structure « Java

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Java » Collections Data Structure » IteratorScreenshots 
Array Iterator
   

/**
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
*/
/*
 * Created on Apr 17, 2005
 */

import java.util.*;

/**
 @author J. H. S.
 */
public class ArrayUtilities {

  /**
   
   */
  private ArrayUtilities() {
    super();
  }

  public static Iterator iterator(Object[] array, int offset, int length) {
    return new ArrayIterator(array, offset, length);
  }
  
  private static class ArrayIterator implements Iterator {
    private final Object[] array;
    private final int top;
    private int offset;
    
    public ArrayIterator(Object[] array, int offset, int length) {
      this.array = array;
      this.offset = offset;
      this.top = offset + length;
    }
    
    /* (non-Javadoc)
     * @see java.util.Iterator#hasNext()
     */
    public boolean hasNext() {
      return this.offset < this.top;
    }
    
    /* (non-Javadoc)
     * @see java.util.Iterator#next()
     */
    public Object next() {
      return this.array[this.offset++];
    }
    
    /* (non-Javadoc)
     * @see java.util.Iterator#remove()
     */
    public void remove() {
      throw new UnsupportedOperationException();
    }
  }
}

   
    
    
  
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2. De-mystify the Iterator interface, showing how to write a simple Iterator for an Array of Objects
3. Iterate over Set
4. Demonstrate iterators.
5. Use the for-each for loop to cycle through a collection.
6. List IteratorList Iterator
7. Iterate a Collection and remove an item (Exception, wrong version)
8. Use an Iterator and remove the item with Iterator.remove()
9. An Iterator wrapper for an Enumeration.
10. EmptyIterator is an iterator which is empty.
11. Implements an java.util.Iterator over any array
12. Treat an Iterator as an Iterable
13. Iterator class for sparse values in an array.
14. Iterator class for values contained in an array range.
15. Cyclic Iteration
16. Create singleton Iterator
17. Empty Iterator
18. An Iterator that wraps a number of Iterators
19. An Iterator to iterate over the elements of an array
20. Sorted Iterator
21. Iterator Union of Iterators
22. Iterator Utils
23. Linked Iterator
24. Prefetch Iterator
25. Protects an given iterator by preventing calls to remove().
26. An Iterator that returns the elements of a specified array, or other iterators etc.
27. An Iterator wrapper for an Object[], allow us to deal with all array like structures in a consistent manner.
28. An array iterator
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