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【Java面试】HashMap死循环问题

问题最近几道面试题被问了是否了解并发情况下JDK7中HashMap发生死循环，导致CPU占用100%的问题。由于HashMap并非是线程安全的，所以在高并发的情况下必然会出现问题，这是一个普遍的问题。如果是在单线程下使用HashMap，自然是没有问题的，如果后期由于代码优化，这段逻辑引入了多线程并发...

【Java面试】HashMap最全面试题（三）

ConcurrentHashMap 底层具体实现知道吗？实现原理是什么？JDK1.7首先将数据分为一段一段的存储，然后给每一段数据配一把锁，当一个线程占用锁访问其中一个段数据时，其他段的数据也能被其他线程访问。在JDK1.7中，ConcurrentHashMap采用Segment + HashEnt...

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【Java面试】HashMap最全面试题（二）

HashMap是怎么解决哈希冲突的？在解决这个问题之前，我们首先需要知道什么是哈希冲突，而在了解哈希冲突之前我们还要知道什么是哈希才行；什么是哈希？Hash，一般翻译为“散列”，也有直接音译为“哈希”的，这就是把任意长度的输入通过散列算法，变换成固定长度的输出࿰...

【Java面试】HashMap最全面试题（一）

如需获取更多的面试题，可以通过给我的Github项目点赞来免费的向我获取Github项目地址说一下 HashMap 的实现原理？HashMap概述： HashMap是基于哈希表的Map接口的非同步实现(线程不安全)。此实现提供所有可选的映射操作，并允许使用null值和null键。此类不保证映射的顺序...

Java 最常见面试题：如何决定使用 HashMap 还是 TreeMap？

对于在Map中插入、删除和定位元素这类操作，HashMap是最好的选择。然而，假如你需要对一个有序的key集合进行遍历，TreeMap是更好的选择。基于你的collection的大小，也许向HashMap中添加元素会更快，将map换为TreeMap进行有序key的遍历。

＜Java八股文面试＞HashMap深度解析 , 一文让你彻底搞懂HashMap（二）

4.4.2 情况2—当某些节点为NULL情况2：remove 树节点时，若 root、root.left、root.right、root.left.left 有一个为 null ，也会退化为链表退化过程图解:备注:检查节点是在移除之前进行的,如果移除(以上四种)之前存在,则移除之后依旧不会退化当执行...

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