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Baidu Software Engineer Interview Question

I interviewed in Beijing, Beijing (China) and was asked:
"Describe the difference between HashMap and HashTable"
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Part of a Software Engineer Interview Review - one of 25 Baidu Interview Reviews

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HashTable is based on the old Dictionary class, and HashMap is based on Map interface since Java 1.2;
HashTable is thread safe while HashMap is not, and HashMap has better performance
HashMap allows null for a key value
- Interview Candidate on Oct 3, 2011 Flag Response

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