81 lines
2.8 KiB
Java
81 lines
2.8 KiB
Java
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8188055
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* @summary Basic functional test of Reference.refersTo.
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*/
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.PhantomReference;
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import java.lang.ref.SoftReference;
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import java.lang.ref.WeakReference;
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public class ReferenceRefersTo {
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private static final void fail(String msg) throws Exception {
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throw new RuntimeException(msg);
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}
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private static final <T extends Reference> void test(T ref,
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Object expectedValue,
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Object unexpectedValue,
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String kind) throws Exception {
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if ((expectedValue != null) && ref.refersTo(null)) {
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fail(kind + "refers to null");
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}
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if (!ref.refersTo(expectedValue)) {
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fail(kind + " doesn't refer to expected value");
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}
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if (ref.refersTo(unexpectedValue)) {
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fail(kind + " refers to unexpected value");
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}
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}
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public static void main(String[] args) throws Exception {
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var queue = new ReferenceQueue<Object>();
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var obj0 = new Object();
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var obj1 = new Object();
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var obj2 = new Object();
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var obj3 = new Object();
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var pref = new PhantomReference(obj0, queue);
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var wref = new WeakReference(obj1);
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var sref = new SoftReference(obj2);
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test(pref, obj0, obj3, "phantom");
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test(wref, obj1, obj3, "weak");
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test(sref, obj2, obj3, "soft");
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pref.clear();
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wref.clear();
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sref.clear();
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test(pref, null, obj3, "phantom");
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test(wref, null, obj3, "weak");
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test(sref, null, obj3, "soft");
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}
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}
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