1 /*
 2  * Copyright (c) 2000, 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 4316678
27  * @summary test that Calendar's Serialization works correctly.
28  * @run junit bug4316678
29  */
30 
31 import java.io.FileInputStream;
32 import java.io.FileOutputStream;
33 import java.io.IOException;
34 import java.io.ObjectInputStream;
35 import java.io.ObjectOutputStream;
36 import java.util.Calendar;
37 import java.util.GregorianCalendar;
38 import java.util.TimeZone;
39 
40 import org.junit.jupiter.api.AfterAll;
41 import org.junit.jupiter.api.BeforeAll;
42 import org.junit.jupiter.api.Test;
43 
44 import static org.junit.jupiter.api.Assertions.assertEquals;
45 
46 public class bug4316678 {
47 
48     private static final String serializedData = "bug4316678.ser";
49 
50     // Save JVM default TimeZone
51     private static final TimeZone savedTz = TimeZone.getDefault();
52 
53     // Set custom JVM default TimeZone
54     @BeforeAll
55     static void initAll() {
56         TimeZone.setDefault(TimeZone.getTimeZone("PST"));
57     }
58 
59     // Restore JVM default Locale and TimeZone
60     @AfterAll
61     static void tearDownAll() {
62         TimeZone.setDefault(savedTz);
63     }
64 
65     // Test that a serialized GregorianCalendar has the expected values
66     @Test
67     public void serializationTest() throws IOException, ClassNotFoundException {
68         GregorianCalendar gc1 = new GregorianCalendar(2000, Calendar.OCTOBER, 10);
69         GregorianCalendar gc2;
70         try (ObjectOutputStream out
71                 = new ObjectOutputStream(new FileOutputStream(serializedData))) {
72             out.writeObject(gc1);
73         }
74 
75         try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(serializedData))) {
76             gc2 = (GregorianCalendar)in.readObject();
77         }
78 
79         gc1.set(Calendar.DATE, 16);
80         gc2.set(Calendar.DATE, 16);
81         assertEquals(gc2.getTime(), gc1.getTime(),
82                 "Times should be equal after serialization");
83     }
84 }