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difference between HashMap, Hashset and hashTable?
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Answer Posted / adarsh m thimmappa
HashTable is a hashing based key-value pair data structure
- doesn't allow null as key
- doesn't allow null as value as well
- not thread safe
- oldest map based data structure available since earlier versions of java
HashMap is a hashing based key-value pair data structure
- allow one null as key
- allows multiple null as more than one value
- not thread safe
HashSet is a hashing based set representation
- holds unique set of keys
- internally uses HashMap
- allows one null value
- not thread safe
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