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漫画：什么是HashMap？
source link: https://juejin.im/post/5a215783f265da431d3c7bba
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————————————众所周知，HashMap是一个用于存储Key-Value键值对的集合，每一个键值对也叫做Entry。这些个键值对（Entry）分散存储在一个数组当中，这个数组就是HashMap的主干。HashMap数组每一个元素的初始值都是Null。
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