List＜E＞ subList(int fromIndex, int toIndex)会存在什么问题呢

进击的猿小白

于 2025-01-12 10:00:00 发布

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分类专栏： JAVA常见问题复盘文章标签： java

本文链接：https://blog.youkuaiyun.com/qqqqqqhhhhhh/article/details/145063415

一、问题复现

 private static void wrong() {
        List<Integer> list = IntStream.rangeClosed(1, 10).boxed().collect(Collectors.toList());
        List<Integer> subList = list.subList(1, 4);
        System.out.println(subList);
        subList.remove(1);
        System.out.println(list);
        System.out.println(subList);
        list.add(0);
        try {
            System.out.println(list);
            System.out.println(subList);
            subList.forEach(System.out::println);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

输出：

[2, 3, 4]
[1, 2, 4, 5, 6, 7, 8, 9, 10]
[2, 4]
[1, 2, 4, 5, 6, 7, 8, 9, 10, 0]
java.util.ConcurrentModificationException
at java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1239)
&nb