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The Trove library provides high speed regular and primitive collections for Java.

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///////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2001, Eric D. Friedman All Rights Reserved.
// Copyright (c) 2009, Rob Eden All Rights Reserved.
// Copyright (c) 2009, Jeff Randall All Rights Reserved.
//
// 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 General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
///////////////////////////////////////////////////////////////////////////////

package gnu.trove.iterator;

/**
 * Implements all iterator functions for the hashed object set.
 * Subclasses may override objectAtIndex to vary the object
 * returned by calls to next() (e.g. for values, and Map.Entry
 * objects).
 * 
 * 
 Note that iteration is fastest if you forego the calls to
 * hasNext in favor of checking the size of the structure
 * yourself and then call next() that many times:
 * 

 * 
 * Iterator i = collection.iterator();
 * for (int size = collection.size(); size-- > 0;) {
 *   Object o = i.next();
 * }
 * 
 * 
 * 
You may, of course, use the hasNext(), next() idiom too if
 * you aren't in a performance critical spot.
 */
public interface TPrimitiveIterator extends TIterator {
    /**
     * Returns true if the iterator can be advanced past its current
     * location.
     *
     * @return a boolean value
     */
    public boolean hasNext();


    /**
     * Removes the last entry returned by the iterator.
     * Invoking this method more than once for a single entry
     * will leave the underlying data structure in a confused
     * state.
     */
    public void remove();

} // TPrimitiveIterator