ANR Software Private Limited Associate Java Developer Interview Questions and Answers

Q1. Lookup vs graphlookup in mongodb
Ans. 
Lookup is used to perform a left outer join in MongoDB, while graphlookup is used to perform recursive graph traversal.
• Lookup is used to perform a left outer join between two collections in MongoDB.

• Graphlookup is used to perform recursive graph traversal in a collection that contains graph data.

• Lookup can only perform a single level join, while graphlookup can perform multiple levels of traversal.

• Lookup is faster than
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Q2. Count frequency of each character in string
Ans. 
Use a hashmap to count the frequency of each character in a string.
• Create a hashmap to store characters as keys and their frequencies as values.

• Iterate through the string and update the hashmap accordingly.

• Return the hashmap with character frequencies.
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Q1. Create a rest api all the way from controller to repository using NOTEPAD
Ans. 
Creating a REST API from controller to repository using NOTEPAD
• Create a controller class with mapping annotations for REST endpoints

• Implement service layer to handle business logic and interact with repository

• Define repository interface with methods for data access operations

• Use Spring Boot for easy setup and configuration

• Test API endpoints using tools like Postman
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Q2. Couldnt write custom mongodb query at repository layer in notepad which rejected my candidature.
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Q1. Question asked from javascript and Angular.
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Q1. Asking how will you handle pressure and whats your strength and weekness.
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Q1. Discussion on Salary negotiation
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It was ok. I was not able to solve all the questions.

Q1. Remove the last element from a linkedlist
Ans. 
To remove the last element from a linked list, iterate to the second last node and update its next pointer to null.
• Iterate through the linked list to find the second last node

• Update the next pointer of the second last node to null
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Q2. Some basic questions on oops dbms and os
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The interviewer asked about javascript basics and DSA questions and some typescript questions

Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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60mintues DSA level coding exam

5 coding questions in 45 mins ...very easy questions, you can easily do..pen paper based exam. Programs were on strings, arrays and patterns

Round 2 is also coding test here questions were moderate. 3 questions given for 1.5 hours..
Again string and pattern programs were given.
Candidate should be clear with loops , strings arrays..thats it.. no need of studying linked lists ,stacks, queues or other data structures..your knowledge of algorithms doesnt matter here..its all about patterns, strings, arrays and loops

It is last coding round..here there is too much politics those who are working there call there friends and make them sit directly in final round..3 questions given no limit on time you have to do any 2 . They will roam around in roam and will discuss your code..they will help there friends as i was there without any referral there was noone for me..but it doesn't matter if u have strong basics u can crack it ..because problems are again on strings, arrays,patterns . I got bored doing same problems.

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