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/*
* Copyright (c) 2001, 2005, 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.
*/
/*
* @test
* @bug 4486049 6282555 6318622
* @summary toString method fails if size changes in between a call to size
* and an attempt to iterate.
* @author Josh Bloch, Martin Buchholz
*/
import java.util.AbstractCollection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Vector;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
public class ToString {
private static void realMain(String[] args) {
testCollection(new LinkedHashSet<Object>() {
public int size() {
return super.size() + 1; // Lies, lies, all lies!
}});
testCollection(new ArrayList<Object>());
testCollection(new Vector<Object>());
testCollection(new CopyOnWriteArrayList<Object>());
testCollection(new CopyOnWriteArraySet<Object>());
}
private static void testCollection(Collection<Object> c) {
System.out.println(c.getClass());
equal(c.toString(), "[]");
check(c.add("x"));
equal(c.toString(), "[x]");
check(c.add("y"));
equal(c.toString(), "[x, y]");
check(c.add(null));
equal(c.toString(), "[x, y, null]");
if (c instanceof AbstractCollection) {
check(c.add(c));
equal(c.toString(), "[x, y, null, (this Collection)]");
}
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() { passed++; }
static void fail() { failed++; Thread.dumpStack(); }
static void fail(String msg) { System.out.println(msg); fail(); }
static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
static void check(boolean cond) { if (cond) pass(); else fail(); }
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else {System.out.println(x + " not equal to " + y); fail(); }}
public static void main(String[] args) throws Throwable {
try { realMain(args); } catch (Throwable t) { unexpected(t); }
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new Exception("Some tests failed");
}
}
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