HCLTech Software Engineer2 Interview Questions and Answers

Q1. Difference between SQL and NoSQL databases?
Ans. 
SQL databases are relational databases with structured data and predefined schema, while NoSQL databases are non-relational databases with flexible schema and unstructured data.
• SQL databases use structured query language for defining and manipulating data, while NoSQL databases use different query languages or APIs.

• SQL databases are table-based, with rows and columns, while NoSQL databases can be document-based, key-va...read more
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Q2. What are the methods for enabling communication between microservices?
Ans. 
Methods for enabling communication between microservices
• RESTful APIs

• Message queues (e.g. RabbitMQ, Kafka)

• gRPC (Google Remote Procedure Call)

• Service mesh (e.g. Istio, Linkerd)

• Event-driven architecture (e.g. using Apache Kafka)
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Q1. Daemon thread in java
Ans. 
Daemon thread is a low priority thread that runs in the background and does not prevent the JVM from exiting.
• Daemon threads are used for tasks that do not require user interaction or continuous execution.

• They are automatically terminated when all non-daemon threads have finished.

• Set a thread as daemon using setDaemon(true) method before starting it.

• Example: Thread t = new Thread(); t.setDaemon(true); t.start();
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Basic aptitude questions based on profit and loss

Coding test based on c language and python programming

Communication assignment based on English

Q1. Self introduction
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Q2. Difine real time operation system
Ans. 
Real-time operating systems are designed to provide guaranteed response times for critical tasks.
• Real-time operating systems prioritize tasks based on their urgency and importance.

• They are commonly used in industries such as aerospace, automotive, and industrial automation.

• Examples include VxWorks, QNX, and FreeRTOS.
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Q1. Self introduction
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Q2. Project work questions
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