Java中ArrayList删除指定位置元素时，remove (int)与remove (Object)重载歧义和索引位移最易踩坑。 本文给出倒序删除、迭代器安全删除等可复制写法，并演示如何把ConcurrentModificationException堆栈通过TaoToken统一Key通道快速定位根因。

这篇文章面向 Java 初学者，把 Collection 接口、ArrayList、LinkedList 的差异和选型讲清楚，同时用 TaoToken 统一 Key 接入 AI 工具辅助生成示例代码，正文会给出可复制的 settings.json 骨架和依赖配置，最后带你编译运行、增删改查验证一遍。你跟着做，半小时内能把集合基础跑通。

ArrayList is a dynamic array. In other words, you don't need to specify the size at the beginning, you can store values one after another as you go.

The main problem was 'class file has wrong version 55.0, should be 52.0'. This is caused when the Jar that I have included in the project was compiled with Java 11. The person who compiled that Jar ...

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