Zamil Hvac Engineer Interview Questions and Answers

Q1. Multi threading print odd even with 2 threads but output should be in sync
Ans. 
Use two threads to print odd and even numbers in sync
• Create two threads, one for printing odd numbers and one for printing even numbers

• Use synchronization mechanisms like mutex or semaphore to ensure output is in sync

• Example: Thread 1 prints odd numbers (1, 3, 5, ...) and Thread 2 prints even numbers (2, 4, 6, ...)
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Q2. Largest common prefix in string array
Ans. 
Find the largest common prefix among an array of strings.
• Iterate through the characters of the first string and compare with the corresponding characters of other strings.

• Stop when a mismatch is found or when reaching the end of any string.

• Return the prefix found so far.
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Q1. Saga pattern in microservice
Ans. 
Saga pattern is a design pattern used in microservices architecture to manage distributed transactions.
• Saga pattern breaks down a transaction into a series of smaller, independent steps.

• Each step in the saga is a separate transaction that can be rolled back if needed.

• If one step fails, compensating transactions can be executed to undo the changes made by previous steps.

• Saga pattern helps maintain data consistency in a ...read more
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Q2. API validation and security
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Q1. Micro service inter communication
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Q2. Hash map hash set implementation
Ans. 
Hash map and hash set are data structures that use hashing to store key-value pairs and unique values respectively.
• Hash map uses key-value pairs where keys are hashed to find the corresponding value

• Hash set stores unique values using hashing to quickly check for duplicates

• Example: HashMap<String, Integer> map = new HashMap<>(); HashSet<Integer> set = new HashSet<>();
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Q1. Validation frame work .
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Q2. Design pattern , .
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Q3. Singleton pattern and how to break
Ans. 
Singleton pattern ensures a class has only one instance and provides a global point of access to it.
• Singleton pattern involves a private constructor, a static method to access the instance, and a static variable to hold the instance.

• To break the singleton pattern, one can use reflection to access the private constructor and create multiple instances.

• Another way to break the singleton pattern is by using serialization a
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Q1. Negotiation on package .
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Q2. Why to join here
Ans. 
I am excited about the innovative projects and collaborative team environment at this company.
• Opportunity to work on cutting-edge projects

• Collaborative team environment

• Strong company culture and values

• Room for growth and advancement

• Positive reputation in the industry
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Q1. Project related
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Q1. Scenario based question on kafka
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Q1. Design a system like youtube
Ans. 
Design a system similar to YouTube for video sharing and streaming
• Implement user authentication and authorization for uploading and viewing videos

• Create a database to store video metadata, user information, and comments

• Develop a recommendation algorithm based on user preferences and viewing history

• Utilize a content delivery network (CDN) for efficient video streaming

• Include features like video monetization, live stream
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It was good experience as a. Fresher

Q1. How are you feeling right now
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