diff a/test/jdk/java/lang/Object/ValueObjects.java b/test/jdk/java/lang/Object/ValueObjects.java --- /dev/null +++ b/test/jdk/java/lang/Object/ValueObjects.java @@ -0,0 +1,172 @@ +/* + * Copyright (c) 2026, 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 + * @summary Basic test of Object methods on value objects + * @enablePreview + * @library /test/lib + * @run junit ${test.main.class} + */ + +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.TimeUnit; + +import org.junit.jupiter.api.Test; +import org.junit.jupiter.params.provider.MethodSource; +import static org.junit.jupiter.api.Assertions.*; + +import jdk.test.lib.Utils; + +class ValueObjects { + + /** + * Test the Object.clone method on a value object. It should return an object that + * is indistinguishable from the original. + */ + @Test + void testClone() throws Exception { + value class V implements Cloneable { + @Override + protected V clone() throws CloneNotSupportedException { + return (V) super.clone(); + } + } + + var obj = new V(); + assertSame(obj, obj.clone()); + } + + /** + * Test the Object.clone method on a value object when the value class does + * not implement Cloneable. + */ + @Test + void testCloneNotSupportedException() throws Exception { + value class V { + @Override + protected V clone() throws CloneNotSupportedException { + return (V) super.clone(); + } + } + + var obj = new V(); + assertThrows(CloneNotSupportedException.class, obj::clone); + } + + /** + * Test that the finalize method on a value class is not invoked by the GC. + */ + @Test + void testValueClassFinalize() throws Exception { + value class V { + CountDownLatch latch; + V(CountDownLatch latch) { + this.latch = latch; + } + @Override + protected void finalize() { + latch.countDown(); + } + } + + var latch = new TimeoutAdjustingLatch(); + var obj = new V(latch); + obj = null; + for (int i = 0; i < 3; i++) { + System.gc(); + // latch should not count down + assertFalse(latch.await(100, TimeUnit.MILLISECONDS)); + } + } + + /** + * Test that the finalize method on an abstract value value is not invoked by the GC. + */ + @Test + void testAbstractValueClassFinalize() throws Exception { + abstract value class AV { + CountDownLatch latch; + AV(CountDownLatch latch) { + this.latch = latch; + } + @Override + protected void finalize() { + latch.countDown(); + } + } + /*identity*/ class C extends AV { + C(CountDownLatch latch) { + super(latch); + } + } + + var latch = new TimeoutAdjustingLatch(); + var obj = new C(latch); + obj = null; + for (int i = 0; i < 3; i++) { + System.gc(); + // latch should not count down + assertFalse(latch.await(100, TimeUnit.MILLISECONDS)); + } + } + + /** + * Test that the wait/notify methods on a value object throw IMSE. + */ + @Test + void testWaitNotify() { + value class V {} + Object obj = new V(); + assertThrows(IllegalMonitorStateException.class, () -> obj.wait()); + assertThrows(IllegalMonitorStateException.class, () -> obj.wait(1000)); + assertThrows(IllegalMonitorStateException.class, () -> obj.wait(1000, 10)); + assertThrows(IllegalMonitorStateException.class, () -> obj.notify()); + assertThrows(IllegalMonitorStateException.class, () -> obj.notifyAll()); + } + + /** + * Test default toString method. + */ + @Test + void testToString() { + value class V { } + var obj = new V(); + String expected = V.class.getName() + "@" + Integer.toHexString(obj.hashCode()); + assertEquals(expected, obj.toString()); + } + + /** + * A CountDownLatch that is created with a count of 1 and with a timed-await method + * that adjusts the timeout based on the jtreg timeout factory configuration. + */ + private static class TimeoutAdjustingLatch extends CountDownLatch { + TimeoutAdjustingLatch() { + super(1); + } + @Override + public boolean await(long timeout, TimeUnit unit) throws InterruptedException { + return super.await(Utils.adjustTimeout(timeout), unit); + } + } +}