Why does HashMap allow null whereas HashTable does not allow null?

Why does HashMap allow null whereas HashTable does not allow null?

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: hard

标签: interviewbit, java-collections, topic-specific, java, data-structures

参考答案摘要

The objects used as keys must implement the hashCode and equals methods in order to successfully save and retrieve objects from a HashTable. These methods cannot be implemented by null because it is n...

本题提供 STAR 原则详细解答和技术解析，登录匠人学院学习中心即可查看完整答案。