Seven Bits Technologies Software Engineer Interview Questions and Answers

Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Q1. Projects, previous work , dsa and database
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Q1. System design , dsa
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Q1. Behavioural, system design
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Q1. General discussion , salary
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There was a hacker rank assignment

Leetcode style question, medium

Q1. What is Java String pool?
Ans. 
Java String pool is a special memory area in Java heap where String literals are stored to optimize memory usage.
• String pool is a part of Java heap memory.

• String literals are stored in the String pool to avoid duplicate objects.

• Strings created using double quotes are stored in the String pool.

• Strings created using new keyword are not stored in the String pool.
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Q1. Did you have any conflicts with your peers and have did you handle it?
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Q1. System design question normal
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Coding question of moderate difficulty

Q1. They asked Java coding question
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Q1. 1) Largest Palindrom in a substring 2) Difference between wait and sleep in Thread 3) SQL join queries 4) Second largest employee salary SQL Query 5) First level and second level cache in hibernate 6) Diff...read more
Ans. 
Interview questions for Senior Software Engineer
• 1) Largest Palindrom in a substring - use two pointers approach

• 2) Difference between wait and sleep in Thread - wait releases the lock, sleep doesn't

• 3) SQL join queries - inner, outer, left, right, self joins

• 4) Second largest employee salary SQL Query - use subquery or order by and limit

• 5) First level and second level cache in hibernate - first level is session specific, ...read more
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Q1. 1) Get most used word in a sentence. 2) Explain DI and IOC in spring. 3) What is predestroy and postconstruct in spring 4) SpringBoot annotations 5) Questions from previous projects
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Interview questions for Senior Software Engineer position
• To get most used word in a sentence, split the sentence into words and use a hashmap to count the frequency of each word

• DI (Dependency Injection) is a design pattern where objects are passed their dependencies rather than creating them. IOC (Inversion of Control) is a container that manages the dependencies and injects them into the objects

• Predestroy and postcons...read more
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Q1. Why do you want to join ADF? Salary negotiation.
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