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Hewlett Packard Enterprise
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I applied via Campus Placement and was interviewed before Aug 2023. There were 2 interview rounds.
Basics of computer science
Use a Set data structure to remove duplicates from a list of strings.
Create a Set to store unique elements
Iterate through the list and add each element to the Set
Convert the Set back to a list to get the list without duplicates
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Hashmap is key-value pair collection while Hashset is a unique value collection.
Hashmap allows duplicate values but not duplicate keys while Hashset only allows unique values.
Hashmap uses key to access values while Hashset uses object reference.
Hashmap is faster for accessing values while Hashset is faster for checking if a value exists.
Example: Hashmap - {1: 'apple', 2: 'banana', 3: 'apple'}, Hashset - {'apple', 'bana
Hashmap is a data structure that stores key-value pairs and uses hashing to locate values based on their keys.
Hashmap uses an array to store the key-value pairs
The key is hashed to generate an index in the array
If multiple keys hash to the same index, a linked list is used to store them
Hashmap provides constant time complexity for insertion, deletion, and retrieval of values
Java's HashMap class is an implementation of
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