1 /*
 2  * Copyright (c) 1998, 2023, 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
16  * 2 along with this work; if not, write to the Free Software Foundation,
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
21  * questions.
22  */
23 
24 /*
25  * @test
26  * @bug 4028518
27  * @summary Ensure cloned GregorianCalendar is unchanged when modifying its original.
28  * @run junit bug4028518
29  */
30 
31 import java.util.GregorianCalendar;
32 
33 import static java.util.Calendar.DAY_OF_MONTH;
34 
35 import org.junit.jupiter.api.Test;
36 
37 import static org.junit.jupiter.api.Assertions.assertNotEquals;
38 
39 public class bug4028518 {
40 
41     /*
42      * Ensure modifying the original GregorianCalendar does not
43      * modify the cloned one as well
44      */
45     @Test
46     public void clonedShouldNotChangeOriginalTest() {
47         GregorianCalendar cal1 = new GregorianCalendar() ;
48         GregorianCalendar cal2 = (GregorianCalendar) cal1.clone() ;
49         cal1.add(DAY_OF_MONTH, 1) ;
50         assertNotEquals(cal1.get(DAY_OF_MONTH), cal2.get(DAY_OF_MONTH),
51                 "Cloned calendar should not have same value as original");
52     }
53 }