1 /*
 2  * Copyright (c) 2022, 2025, 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
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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
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22  */
23 
24 /*
25  * @test
26  * @summary Method handle and core reflection to invoke on the constructor of
27  *          java.lang.Object (abstract class) should return an Identity instance
28  * @enablePreview
29  * @run testng/othervm ObjectNewInstance
30  */
31 
32 import java.lang.invoke.MethodHandle;
33 import java.lang.invoke.MethodHandles;
34 import java.lang.invoke.MethodType;
35 import java.lang.reflect.Constructor;
36 
37 import org.testng.annotations.Test;
38 import static org.testng.Assert.*;
39 
40 public class ObjectNewInstance {
41     @Test
42     public void classNewInstance() throws ReflectiveOperationException {
43         Object o = Object.class.newInstance();
44         assertTrue(o.getClass() == Object.class);
45     }
46 
47     @Test
48     public void constructorNewInstance() throws ReflectiveOperationException {
49         Constructor<Object> ctor = Object.class.getDeclaredConstructor();
50         Object o = ctor.newInstance();
51         assertTrue(o.getClass() == Object.class);
52     }
53 
54     @Test
55     public void methodHandle() throws Throwable {
56         MethodHandle mh = MethodHandles.publicLookup()
57                                        .findConstructor(Object.class, MethodType.methodType(void.class));
58         Object o = mh.invokeExact();
59         assertTrue(o.getClass() == Object.class);
60     }
61 }