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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 
main(String[] args)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 
printdate(GregorianCalendar cal, String string)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 }
57