Why does HashMap allow one null key, but Hashtable doesn’t?

Why does HashMap allow one null key, but Hashtable doesn’t?

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: medium

标签: interviewbit, java, topic-specific

参考答案摘要

HashMap is newer and designed to allow one null key and many null values. Hashtable is older and does not allow any null keys or values. This was done to avoid confusion in old thread-safe designs. Yo...

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