Java面试训练营 - SiKi学院|SiKi学堂 - unity|u3d|虚幻|ue4/5|java|python|人工智能|视频教程|在线课程

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Java面试训练营

最新更新于 2021-07-11

价格 ¥ 199.00

学习有效期 365 天（随到随学）

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课程介绍

Java核心

HashMap
- hashmap 底层的数据结构
- 为什么引入红黑树
- 链表和红黑树转换的条件
- 为什么链表转红黑树的阈值是 8
- 为什么红黑树转回链表阈值是6而不是8呢
- HashMap 重要属性，及他们的作用
- threshold 除了存放扩容阈值外还有其他作用吗
- Hash 的默认容量是多少？容量有什么限制？
- loadFactor 默认的负载因子是多少，为什么是这个值？
- HashMap 的容量为什么要是2的N次方
- 说说HashMap 的插入的流程
- 说说HashMap resize 的过程
- 红黑树和链表在resize 过程中通过 hash & aldcap == 0 定位，这么做的原理
- HashMap 是如何计算key的hash值的 （1.8）
- 为什么用hashcode 的高16做异或运算
- HashMap 是线程安全的吗
- HashMap 的死循环问题
- 总结下JDK 在1.8对HashMap做了哪些优化
线程池

目录

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