Ericsson SDE (Software Development Engineer) Interview Questions and Answers

Q1. Basic Concept of OOPs, Java, Spring Boot, MySQL.
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Q2. Find the kth smallest value in an unsorted array
Ans. 
Find the kth smallest value in an unsorted array
• Sort the array and return the kth element

• Use quickselect algorithm to find the kth smallest element in O(n) time

• Build a min heap of size k and traverse the array to find the kth smallest element
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Q3. Merge Sort Algorithm Implementation
Ans. 
Merge Sort is a divide and conquer algorithm that divides an array into two halves, sorts them and then merges them.
• Divide the array into two halves recursively

• Sort each half recursively using merge sort

• Merge the two sorted halves

• Time complexity is O(nlogn)

• Space complexity is O(n)
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Q1. Detailed discussion on the project I have worked on.
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Q2. What is a Load Balancer?
Ans. 
A Load Balancer distributes incoming network traffic across multiple servers to improve performance and availability.
• It helps to avoid overloading a single server

• It improves responsiveness and availability of applications

• It can be hardware or software-based

• Examples include Amazon ELB, F5 BIG-IP, and NGINX

• It can also perform health checks on servers and route traffic accordingly
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Q3. Difference between Spring MVC and Spring Boot
Ans. 
Spring MVC is a framework for building web applications, while Spring Boot is an opinionated framework for building standalone applications.
• Spring MVC requires more configuration and setup compared to Spring Boot

• Spring Boot provides a pre-configured environment with sensible defaults

• Spring Boot includes an embedded server, making it easier to deploy standalone applications

• Spring MVC is more suitable for building tradit...read more
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Q4. Difference between SQL and NoSQL
Ans. 
SQL is a relational database management system while NoSQL is a non-relational database management system.
• SQL databases are structured and use tables with predefined schema while NoSQL databases are unstructured and use collections or documents.

• SQL databases use SQL (Structured Query Language) for querying and managing data while NoSQL databases use various query languages like MongoDB's query language.

• SQL databases ar...read more
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Q5. Find the equilibrium index where the sum of all the values before the equilibrium index is equal to the sum of all the values after the equilibrium index.
Ans. 
Find the equilibrium index where the sum of all values before it is equal to the sum of all values after it.
• Iterate through the array and calculate the total sum.

• Then iterate again and keep track of the left sum and right sum.

• If they are equal at any index, return that index as the equilibrium index.
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90 Mins on amcat global platform, 2 Easy level questions on Array and two pointers

Q1. Print all the Elements not present in a sorted array and tell the time and space complexity of the algorithm.
Ans. 
Print all elements not present in a sorted array with time and space complexity.
• Iterate through array and print missing elements

• Use binary search for faster search

• Time complexity: O(n log n)

• Space complexity: O(1)
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Q2. Print all the elements not present in an unsorted array and tell the time and space complexity of the algorithm.
Ans. 
Print all elements not present in an unsorted array and give time and space complexity.
• Iterate through array and use a hashset to keep track of seen elements.

• Print elements not in hashset.

• Time complexity: O(n), Space complexity: O(n)
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Q1. Tell me about yourself, your college , family, hobbies and projects
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Q2. Why do you want to join this company?
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