Can you add a null element into a TreeSet or HashSet?

Can you add a null element into a TreeSet or HashSet?

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: easy

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

参考答案摘要

We can add null elements in a HashSet but we cannot add null elements in a TreeSet. The reason is that TreeSet uses the compareTo() method for comparing and it throws a NullPointerException when it en...

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