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Update Java集合框架常见面试题.md

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`@@ -83,11 +83,11 @@ ArrayList 实现了 RandomAccess 接口, 而 LinkedList 没有实现。为什`
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`84`	`84`	`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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`86`		`-![双向链表](https://ws1.sinaimg.cn/large/006rNwoDgy1g2dp8qi5xij30fk06idgj.jpg)`
	`86`	`+![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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`88`	`88`	`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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`90`		`-![双向循环链表](https://ws1.sinaimg.cn/large/006rNwoDgy1g2dp8a1hxej30eu06zgmd.jpg)`
	`90`	`+![双向循环链表](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/双向循环链表.png)`
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`92`	`92`	`## ArrayList 与 Vector 区别呢?为什么要用Arraylist取代Vector呢?`
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`@@ -451,4 +451,4 @@ Output:`
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`452`	`452`	`Java工程师必备学习资源: 一些Java工程师常用学习资源公众号后台回复关键字 "1" 即可免费无套路获取。`
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`454`		`-![我的公众号](https://user-gold-cdn.xitu.io/2018/11/28/167598cd2e17b8ec?w=258&h=258&f=jpeg&s=27334)`
	`454`	`+![我的公众号](https://user-gold-cdn.xitu.io/2018/11/28/167598cd2e17b8ec?w=258&h=258&f=jpeg&s=27334)`

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