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8340572: ConcurrentModificationException when sorting ArrayList sublists
Reviewed-by: smarks
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/* | ||
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* This code 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 | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
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import java.util.ArrayList; | ||
import java.util.Collections; | ||
import java.util.ConcurrentModificationException; | ||
import java.util.List; | ||
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/** | ||
* @test | ||
* @bug 8340572 | ||
* @summary ConcurrentModificationException when sorting ArrayList sublists | ||
*/ | ||
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public class SortingModCount { | ||
public static void main(String[] args) { | ||
testSortingSubListsDoesNotIncrementModCount(); | ||
testSortingListDoesIncrementModCount(); | ||
} | ||
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private static void testSortingSubListsDoesNotIncrementModCount() { | ||
List<Integer> l = new ArrayList<>(List.of(1, 2, 3, 4)); | ||
var a = l.subList(0, 2); | ||
var b = l.subList(2, 4); | ||
Collections.sort(a); | ||
Collections.sort(b); | ||
} | ||
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private static void testSortingListDoesIncrementModCount() { | ||
List<Integer> l = new ArrayList<>(List.of(1, 2, 3, 4)); | ||
var b = l.subList(2, 4); | ||
Collections.sort(l); | ||
try { | ||
Collections.sort(b); | ||
throw new Error("expected ConcurrentModificationException not thrown"); | ||
} catch (ConcurrentModificationException expected) { | ||
} | ||
} | ||
} |