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I applied via Walk-in and was interviewed in Nov 2021. There was 1 interview round.
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I applied via Referral and was interviewed before Jun 2021. There were 4 interview rounds.
I applied via Naukri.com and was interviewed in Nov 2020. There were 5 interview rounds.
I applied via Recruitment Consulltant and was interviewed in Nov 2021. There were 4 interview rounds.
It was medium level question
Java hash map is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.
HashMap in Java implements the Map interface and allows null keys and values.
It uses hashing to store and retrieve key-value pairs, providing O(1) time complexity for get() and put() operations.
Example: HashMap
I applied via Naukri.com and was interviewed before Apr 2023. There were 3 interview rounds.
Singleton class is a class that can only have one instance, while HashMap is not thread-safe but ConcurrentHashMap is.
Singleton class restricts instantiation to one object, ensuring a single instance throughout the application.
HashMap allows multiple threads to access and modify it concurrently, which can lead to data corruption in a multi-threaded environment.
ConcurrentHashMap is thread-safe and allows multiple thread...
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