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docs/java/collection/ArrayList源码+扩容机制分析.md
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`ArrayList` 的底层是数组队列，相当于动态数组。与 Java 中的数组相比，它的容量能动态增长。在添加大量元素前，应用程序可以使用`ensureCapacity`操作来增加 `ArrayList` 实例的容量。这可以减少递增式再分配的数量。
`ArrayList`继承于 **`AbstractList`**，实现了 **`List`**, **`RandomAccess`**, **`Cloneable`**, **`java.io.Serializable`** 这些接口。
`ArrayList`继承于 **`AbstractList`** ，实现了 **`List`**, **`RandomAccess`**, **`Cloneable`**, **`java.io.Serializable`** 这些接口。
```java