1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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  *
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23 
24 /**
25  * @test
26  * @bug 8234423
27  * @summary Modifying ArrayList.subList().subList() resets modCount of subList
28  */
29 
30 package test.java.util.ArrayList;
31 
32 import java.util.ArrayList;
33 import java.util.ConcurrentModificationException;
34 
35 public class SubListModCount {
36 
main(String[] args)37     public static void main(String[] args) {
38         int failures = 0;
39         var root = new ArrayList<Integer>();
40         var subList = root.subList(0, 0);
41         root.add(42);
42         try {
43             subList.size();
44             failures++;
45             System.out.println("Accessing subList");
46         } catch (ConcurrentModificationException expected) {
47         }
48         var subSubList = subList.subList(0, 0);
49         try {
50             subSubList.size();
51             failures++;
52             System.out.println("Accessing subList.subList");
53         } catch (ConcurrentModificationException expected) {
54         }
55         try {
56             subSubList.add(42);
57             failures++;
58             System.out.println("Modifying subList.subList");
59         } catch (ConcurrentModificationException expected) {
60         }
61         try {
62             subList.size();
63             failures++;
64             System.out.println("Accessing subList again");
65         } catch (ConcurrentModificationException expected) {
66         }
67         if (failures > 0) {
68             throw new AssertionError(failures + " tests failed");
69         }
70     }
71 }
72