NICE Interview Questions, Process, and Tips

Q1. What is BDD and TDD
Ans. 
BDD stands for Behavior Driven Development and TDD stands for Test Driven Development.
• BDD focuses on the behavior of the system from the user's perspective.

• TDD focuses on writing tests before writing the actual code.

• BDD uses natural language to describe the behavior of the system.

• TDD helps in ensuring that the code meets the requirements and is well-tested.

• Both BDD and TDD help in improving the quality of the software
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Q2. What is JUnit and Mockito
Ans. 
JUnit is a unit testing framework for Java, while Mockito is a mocking framework used for creating mock objects in unit tests.
• JUnit is used for writing and running repeatable automated tests to ensure code behaves as expected.

• Mockito is used to create mock objects to simulate the behavior of real objects in unit tests.

• Both JUnit and Mockito are commonly used in test-driven development (TDD) to ensure code quality and r
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Q3. What is microservices architecture
Ans. 
Microservices architecture is an architectural style that structures an application as a collection of loosely coupled services.
• Each service is self-contained and can be developed, deployed, and scaled independently.

• Services communicate with each other over lightweight protocols like HTTP or messaging queues.

• Microservices allow for flexibility, scalability, and easier maintenance compared to monolithic architectures.

• Ex...read more
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Q4. Why HashSet has default size 16
Ans. 
HashSet default size 16 for performance balance between memory usage and lookup time.
• Default size 16 provides a good balance between memory usage and lookup time.

• Choosing a power of 2 size helps in distributing elements evenly across buckets.

• Resizing the HashSet is expensive, so starting with a larger size reduces the need for resizing.

• Example: If the default size was too small, it would lead to more collisions and deg
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Q5. What is diff between ActiveMQ and RabbitMQ
Ans. 
ActiveMQ is Java-based messaging broker while RabbitMQ is a message broker that implements the Advanced Message Queuing Protocol (AMQP).
• ActiveMQ is written in Java and supports multiple messaging protocols like OpenWire, STOMP, MQTT, and AMQP.

• RabbitMQ is written in Erlang and specifically implements the AMQP protocol.

• ActiveMQ is more feature-rich and has a larger user base, while RabbitMQ is known for its reliability a...read more
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Q6. What are databases are present in Azure DB
Ans. 
Azure DB offers various databases including SQL Database, Cosmos DB, MySQL, PostgreSQL, and MariaDB.
• SQL Database

• Cosmos DB

• MySQL

• PostgreSQL

• MariaDB
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Q7. Diff between HashSet and HashMap
Ans. 
HashSet is a collection of unique elements, while HashMap is a key-value pair collection.
• HashSet does not allow duplicate elements, HashMap allows duplicate keys but not duplicate values.

• HashSet uses Set interface, HashMap uses Map interface.

• Example: HashSet set = new HashSet<>(); HashMap map = new HashMap<>();
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Q8. Internal working of HashMap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap allows null keys and values, and...read more
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Q1. Asked about my project
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Q2. Which one is better for loop or foreach loop
Ans. 
It depends on the specific use case and programming language.
• For loop is more flexible and can be used with different data structures.

• Foreach loop is simpler and more readable for iterating over arrays or collections.

• Use for loop when you need to control the iteration more precisely.

• Use foreach loop when you just need to iterate over all elements in an array or collection.
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Q3. Asked about design patterns
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Focus on operating systems, dbms and oops

Focus on data structures and algorithms

Q1. Find the occurrence of each character. "INTERVIEW"
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