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去掉第23行重复的“这个”
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docs/java/collection/arraylist-source-code.md

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@@ -20,7 +20,7 @@ public class ArrayList<E> extends AbstractList<E>
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```
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- `RandomAccess` 是一个标志接口,表明实现这个这个接口的 List 集合是支持**快速随机访问**的。在 `ArrayList` 中,我们即可以通过元素的序号快速获取元素对象,这就是快速随机访问。
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- `RandomAccess` 是一个标志接口,表明实现这个接口的 List 集合是支持**快速随机访问**的。在 `ArrayList` 中,我们即可以通过元素的序号快速获取元素对象,这就是快速随机访问。
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- `ArrayList` 实现了 **`Cloneable` 接口** ,即覆盖了函数`clone()`,能被克隆。
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- `ArrayList` 实现了 `java.io.Serializable`接口,这意味着`ArrayList`支持序列化,能通过序列化去传输。
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