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HashMap is not thread-safe while ConcurrentHashMap is thread-safe.
HashMap is not thread-safe and can lead to ConcurrentModificationException if modified during iteration.
ConcurrentHashMap allows concurrent read and write operations without the need for external synchronization.
ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurren
To find the third highest salary in a SQL table, use the 'SELECT DISTINCT' statement with 'ORDER BY' and 'LIMIT'.
Use 'SELECT DISTINCT' to avoid duplicates
Order the salaries in descending order using 'ORDER BY'
Use 'LIMIT 2,1' to skip the first two highest salaries and retrieve the third highest salary
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posted on 22 Apr 2021
I applied via Recruitment Consulltant and was interviewed before Apr 2021. There were 3 interview rounds.
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I applied via Referral and was interviewed before Feb 2021. There were 2 interview rounds.
I applied via Naukri.com and was interviewed before Oct 2020. There were 5 interview rounds.
posted on 14 May 2018
based on 1 interview
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Senior Software Engineer
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