Technoxander Java Developer Interview Questions and Answers

Q1. Basic questions on java
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SQL query and Program Coding test

Q1. Questions on spring security
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Q2. Questions on unit testing
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Q3. Questions on authorizathion and authentication
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Q1. 1. Different between HashMap and concurrent HashMap?
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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 and locking only a portion of the map during write operations.
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Q2. 2. Why we need abstractions?
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Abstractions help in simplifying complex systems by hiding unnecessary details and focusing on essential features.
• Abstractions help in managing complexity by hiding implementation details and focusing on high-level concepts.

• They allow developers to work at a higher level of understanding without getting bogged down in low-level details.

• Abstractions promote code reusability and maintainability by encapsulating common fu...read more
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