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23 
24 /*
25  * @test
26  * @bug 5097350
27  * @summary Make sure that TimeZone.getTimeZone returns a clone of a cached TimeZone instance.
28  */
29 
30 import java.util.*;
31 import java.text.*;
32 
33 public class Bug5097350 {
34     public static void main(String[] args) {
35         String[] tzids = TimeZone.getAvailableIDs();
36         List<String> ids = new ArrayList<>(tzids.length + 10);
37         ids.addAll(Arrays.asList(tzids));
38         // add some custom ids
39         ids.add("GMT+1");
40         ids.add("GMT-7:00");
41         ids.add("GMT+10:20");
42         ids.add("GMT-00:00");
43         ids.add("GMT+00:00");
44 
45         for (String id : ids) {
46             test(id);
47         }
48     }
49 
50     private static void test(String id) {
51         TimeZone tz1 = TimeZone.getTimeZone(id);
52         int offset1 = tz1.getRawOffset();
53         tz1.setRawOffset(offset1 + 13 * 60 * 60 * 1000);
54 
55         TimeZone tz2 = TimeZone.getTimeZone(id);
56         if (tz1 == tz2) {
57             throw new RuntimeException("TimeZones are identical: " + id);
58         }
59         if (offset1 != tz2.getRawOffset()) {
60             throw new RuntimeException("Offset changed through aliasing: " + id);
61         }
62     }
63 }
64