1 /*
 2  * Copyright (c) 2013, 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
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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
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22  */
23 
24 /*
25  * @test
26  * @bug 8004240
27  * @summary Verify that getAdapterPreference returns an unmodifiable list.
28  * @modules java.base/sun.util.locale.provider
29  * @compile -XDignore.symbol.file GetAdapterPreference.java
30  * @run junit GetAdapterPreference
31  */
32 
33 import java.util.List;
34 import sun.util.locale.provider.LocaleProviderAdapter;
35 
36 import org.junit.jupiter.api.Test;
37 
38 import static org.junit.jupiter.api.Assertions.assertThrows;
39 
40 public class GetAdapterPreference {
41 
42     /**
43      * Test that the list returned from getAdapterPreference()
44      * cannot be modified.
45      */
46     @Test
47     public void immutableTest() {
48         List<LocaleProviderAdapter.Type> types = LocaleProviderAdapter.getAdapterPreference();
49         assertThrows(UnsupportedOperationException.class, () -> types.set(0, null),
50                 "Trying to modify list returned from LocaleProviderAdapter.getAdapterPreference() did not throw UOE");
51     }
52 }