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Update b-2Java集合.md
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docs/b-2Java集合.md

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@@ -56,6 +56,8 @@ public interface RandomAccess {
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**双向链表:** 包含两个指针,一个prev指向前一个节点,一个next指向后一个节点。
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> 另外推荐一篇把双向链表讲清楚的文章:[https://juejin.im/post/5b5d1a9af265da0f47352f14](https://juejin.im/post/5b5d1a9af265da0f47352f14)
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![双向链表](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/双向链表.png)
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**双向循环链表:** 最后一个节点的 next 指向head,而 head 的prev指向最后一个节点,构成一个环。

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