HashMap vs LinkedHashMap || Java interview question 2021

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HashMap:
The underlying data structure is Hashtable.
HashMap required less memory than LinkedHashMap.
Insertion order is not preserved and it is based on hashcode of keys.
Introduced in 1.2 version.

LinkedHashMap:
The underlying data structure is the combination of Hashtable and LinkedList.
LinkedHashMap requires more memory than HashMap.
Insertion order is preserved.
Introduced in 1.4 version.

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