1 /*
   2  * Copyright (c) 1998, 2016, 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 Make sure cloned GregorianCalendar is unchanged by modifying its original.
  28  */
  29 
  30 import java.util.GregorianCalendar ;
  31 import static java.util.Calendar.*;
  32 
  33 public class bug4028518 {
  34 
  35     public static void main(String[] args)
  36     {
  37         GregorianCalendar cal1 = new GregorianCalendar() ;
  38         GregorianCalendar cal2 = (GregorianCalendar) cal1.clone() ;
  39 
  40         printdate(cal1, "cal1: ") ;
  41         printdate(cal2, "cal2 - cloned(): ") ;
  42         cal1.add(DAY_OF_MONTH, 1) ;
  43         printdate(cal1, "cal1 after adding 1 day: ") ;
  44         printdate(cal2, "cal2 should be unmodified: ") ;
  45         if (cal1.get(DAY_OF_MONTH) == cal2.get(DAY_OF_MONTH)) {
  46             throw new RuntimeException("cloned GregorianCalendar modified");
  47         }
  48     }
  49 
  50     private static void printdate(GregorianCalendar cal, String string)
  51     {
  52         System.out.println(string + (cal.get(MONTH) + 1)
  53                            + "/" + cal.get(DAY_OF_MONTH)
  54                            + "/" + cal.get(YEAR)) ;
  55     }
  56 }