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Commons Collections example source code file (TestArrayIterator.java)

This example Commons Collections source code file (TestArrayIterator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

abstracttestiterator, arrayiterator, arrayiterator, iteration, iterator, iterator, nullpointerexception, nullpointerexception, object, object, one, string, testarrayiterator, two, util

The Commons Collections TestArrayIterator.java source code

 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
package org.apache.commons.collections.iterators;

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

import junit.framework.Test;
import junit.framework.TestSuite;

 * Tests the ArrayIterator to ensure that the next() method will actually
 * perform the iteration rather than the hasNext() method.
 * The code of this test was supplied by Mauricio S. Moura.
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * @author James Strachan
 * @author Mauricio S. Moura
 * @author Morgan Delagrange
 * @author Stephen Colebourne
public class TestArrayIterator extends AbstractTestIterator {

    protected String[] testArray = { "One", "Two", "Three" };

    public static Test suite() {
        return new TestSuite(TestArrayIterator.class);

    public TestArrayIterator(String testName) {

    public Iterator makeEmptyIterator() {
        return new ArrayIterator(new Object[0]);

    public Iterator makeFullIterator() {
        return new ArrayIterator(testArray);

    public boolean supportsRemove() {
        return false;

    public void testIterator() {
        Iterator iter = (Iterator) makeFullIterator();
        for (int i = 0; i < testArray.length; i++) {
            Object testValue = testArray[i];
            Object iterValue = iter.next();

            assertEquals("Iteration value is correct", testValue, iterValue);

        assertTrue("Iterator should now be empty", !iter.hasNext());

        try {
            Object testValue = iter.next();
        } catch (Exception e) {
                "NoSuchElementException must be thrown",
                e.getClass().equals((new NoSuchElementException()).getClass()));

    public void testNullArray() {
        try {
            Iterator iter = new ArrayIterator(null);

            fail("Constructor should throw a NullPointerException when constructed with a null array");
        } catch (NullPointerException e) {
            // expected

        ArrayIterator iter = new ArrayIterator();
        try {

            fail("setArray(null) should throw a NullPointerException");
        } catch (NullPointerException e) {
            // expected
    public void testReset() {
        ArrayIterator it = (ArrayIterator) makeFullIterator();
        assertEquals("One", it.next());


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