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6,025 java senior interview questions shared by candidates

nature of class, inheritance, a few db-oriented questions, some spring/hibernate questions. What are my strong points, weak points. Described some difficult technical problems solved, how I handle adverse personal situations.
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Senior Java Developer

Interviewed at Federal Reserve Bank of St. Louis

3.2★
Aug 25, 2016

nature of class, inheritance, a few db-oriented questions, some spring/hibernate questions. What are my strong points, weak points. Described some difficult technical problems solved, how I handle adverse personal situations.

Explain OOP concepts — inheritance, polymorphism, abstraction, encapsulation. AmbitionBox Differences between method overloading vs overriding. AmbitionBox How HashMap vs ConcurrentHashMap work internally. Glassdoor Singleton pattern — how you implement it and thread safety. AmbitionBox How garbage collection works and memory management basics. (common in Java interviews even if not specifically reported)
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Senior Java Developer

Interviewed at Anonymous Content

3.4★
Dec 19, 2025

Explain OOP concepts — inheritance, polymorphism, abstraction, encapsulation. AmbitionBox Differences between method overloading vs overriding. AmbitionBox How HashMap vs ConcurrentHashMap work internally. Glassdoor Singleton pattern — how you implement it and thread safety. AmbitionBox How garbage collection works and memory management basics. (common in Java interviews even if not specifically reported)

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