What is the difference between HashMap and Hashtable in JAVA?

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Q: What happens if we put a key object in a HashMap which exists?

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Q: Is hashmap an ordered collection.

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Q: If two threads access the same hashmap at the same time, what would happen?

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Q: What is the difference between Collection and Collections in JAVA?

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Q: What is the difference between Set and Map in JAVA?

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asked May 26, 2021 in Technology by JackTerrance

JackTerrance · Answer 1 · 2021-05-26T06:46:19+0000

No.	HashMap	Hashtable
1)	HashMap is not synchronized.	Hashtable is synchronized.
2)	HashMap can contain one null key and multiple null values.	Hashtable cannot contain any null key or null value.
3)	HashMap is not ?thread-safe,? so it is useful for non-threaded applications.	Hashtable is thread-safe, and it can be shared between various threads.
4)	4) HashMap inherits the AbstractMap class	Hashtable inherits the Dictionary class.