1 /* 2 * Copyright (c) 2007, 2026, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 6529795 8336669 27 * @summary next() does not change iterator state if throws NoSuchElementException 28 * @author Martin Buchholz 29 */ 30 31 import java.util.ArrayDeque; 32 import java.util.ArrayList; 33 import java.util.Collection; 34 import java.util.HashMap; 35 import java.util.Hashtable; 36 import java.util.IdentityHashMap; 37 import java.util.Iterator; 38 import java.util.LinkedHashMap; 39 import java.util.LinkedList; 40 import java.util.List; 41 import java.util.ListIterator; 42 import java.util.Map; 43 import java.util.NoSuchElementException; 44 import java.util.PriorityQueue; 45 import java.util.TreeMap; 46 import java.util.TreeSet; 47 import java.util.Vector; 48 import java.util.WeakHashMap; 49 import java.util.concurrent.ArrayBlockingQueue; 50 import java.util.concurrent.ConcurrentHashMap; 51 import java.util.concurrent.ConcurrentLinkedDeque; 52 import java.util.concurrent.ConcurrentLinkedQueue; 53 import java.util.concurrent.ConcurrentSkipListMap; 54 import java.util.concurrent.ConcurrentSkipListSet; 55 import java.util.concurrent.CopyOnWriteArrayList; 56 import java.util.concurrent.CopyOnWriteArraySet; 57 import java.util.concurrent.LinkedBlockingQueue; 58 import java.util.concurrent.LinkedTransferQueue; 59 import java.util.stream.IntStream; 60 61 @SuppressWarnings("unchecked") 62 public class IteratorAtEnd { 63 private static final int SIZE = 6; 64 65 static void realMain(String[] args) throws Throwable { 66 testCollection(new ArrayList()); 67 testCollection(new Vector()); 68 testCollection(new LinkedList()); 69 testCollection(new ArrayDeque()); 70 testCollection(new TreeSet()); 71 testCollection(new CopyOnWriteArrayList()); 72 testCollection(new CopyOnWriteArraySet()); 73 testCollection(new ConcurrentSkipListSet()); 74 75 testCollection(new PriorityQueue()); 76 testCollection(new LinkedBlockingQueue()); 77 testCollection(new ArrayBlockingQueue(100)); 78 testCollection(new ConcurrentLinkedDeque()); 79 testCollection(new ConcurrentLinkedQueue()); 80 testCollection(new LinkedTransferQueue()); 81 82 testMap(new HashMap()); 83 testMap(new Hashtable()); 84 testMap(new LinkedHashMap()); 85 testMap(new WeakHashMap()); 86 testMap(new IdentityHashMap()); 87 testMap(new ConcurrentHashMap()); 88 testMap(new ConcurrentSkipListMap()); 89 testMap(new TreeMap()); 90 } 91 92 static void testCollection(Collection c) { 93 try { 94 for (int i = 0; i < SIZE; i++) 95 c.add(i); 96 test(c); 97 } catch (Throwable t) { unexpected(t); } 98 } 99 100 // A strong list of reference to map keys to avoid 101 // spurious purges in WeakHashMap 102 private static final List<String> MAP_KEYS = IntStream 103 .range(0, 3 * SIZE) 104 .mapToObj(i -> "BASE-" + i) 105 .toList(); 106 107 static void testMap(Map m) { 108 try { 109 for (int i = 0; i < 3*SIZE; i++) 110 m.put(MAP_KEYS.get(i), i); 111 test(m.values()); 112 test(m.keySet()); 113 test(m.entrySet()); 114 } catch (Throwable t) { unexpected(t); } 115 } 116 117 static void test(Collection c) { 118 try { 119 assert !c.isEmpty() : "Calling remove on empty iterator will result in IllegalStateException"; 120 final Iterator it = c.iterator(); 121 THROWS(NoSuchElementException.class, 122 () -> { while (true) it.next(); }); 123 try { it.remove(); } 124 catch (UnsupportedOperationException exc) { return; } 125 pass(); 126 } catch (Throwable t) { unexpected(t); } 127 128 if (c instanceof List) { 129 final List list = (List) c; 130 try { 131 final ListIterator it = list.listIterator(0); 132 it.next(); 133 final Object x = it.previous(); 134 THROWS(NoSuchElementException.class, () -> it.previous()); 135 try { it.remove(); } 136 catch (UnsupportedOperationException exc) { return; } 137 pass(); 138 check(! list.get(0).equals(x)); 139 } catch (Throwable t) { unexpected(t); } 140 141 try { 142 final ListIterator it = list.listIterator(list.size()); 143 it.previous(); 144 final Object x = it.next(); 145 THROWS(NoSuchElementException.class, () -> it.next()); 146 try { it.remove(); } 147 catch (UnsupportedOperationException exc) { return; } 148 pass(); 149 check(! list.get(list.size()-1).equals(x)); 150 } catch (Throwable t) { unexpected(t); } 151 } 152 } 153 154 //--------------------- Infrastructure --------------------------- 155 static volatile int passed = 0, failed = 0; 156 static void pass() {passed++;} 157 static void fail() {failed++; Thread.dumpStack();} 158 static void fail(String msg) {System.out.println(msg); fail();} 159 static void unexpected(Throwable t) {failed++; t.printStackTrace();} 160 static void check(boolean cond) {if (cond) pass(); else fail();} 161 static void equal(Object x, Object y) { 162 if (x == null ? y == null : x.equals(y)) pass(); 163 else fail(x + " not equal to " + y);} 164 public static void main(String[] args) throws Throwable { 165 try {realMain(args);} catch (Throwable t) {unexpected(t);} 166 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 167 if (failed > 0) throw new AssertionError("Some tests failed");} 168 interface Fun {void f() throws Throwable;} 169 static void THROWS(Class<? extends Throwable> k, Fun... fs) { 170 for (Fun f : fs) 171 try { f.f(); fail("Expected " + k.getName() + " not thrown"); } 172 catch (Throwable t) { 173 if (k.isAssignableFrom(t.getClass())) pass(); 174 else unexpected(t);}} 175 } --- EOF ---