singleton Iterator - Java java.util

Java examples for java.util:Iterator

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Description

singleton Iterator

Demo Code

/*//  w w w  .  j  a v  a2  s .com
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project. Copyright (C) 2014 - 2015 Lobo Evolution

    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; ivan.difrancesco@yahoo.it
 */
//package com.book2s;

import java.util.Iterator;

import java.util.NoSuchElementException;

public class Main {
    public static void main(String[] argv) {
        Object item = "book2s.com";
        System.out.println(singletonIterator(item));
    }

    public static Iterator singletonIterator(final Object item) {
        return new Iterator() {
            private boolean gotItem = false;

            public boolean hasNext() {
                return !this.gotItem;
            }

            public Object next() {
                if (this.gotItem) {
                    throw new NoSuchElementException();
                }
                this.gotItem = true;
                return item;
            }

            public void remove() {
                if (!this.gotItem) {
                    this.gotItem = true;
                } else {
                    throw new NoSuchElementException();
                }
            }
        };
    }
}

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