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💬 update LinkedHashMap
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MD/collection/LinkedHashMap.md

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# LinkedHashMap 底层分析
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众所周知 `HashMap` 是一个无序的 `Map`,因为每次根据 `key``hashcode` 映射到 `Entry` 数组上,所以遍历出来的顺序并不是写入的顺序。
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