Kellton Associate Android Developer Interview Questions and Answers for Experienced

Round duration - 45 minutes
Round difficulty - Medium

I was asked 2 coding questions, questions from my projects and questions related to different java concepts. One question from cloud computing was also asked.

Q1. 
Maximum Subarray Sum Problem Statement
Given an array arr of length N consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
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Ans. 
Find the sum of the subarray with the maximum sum among all subarrays in a given array.
• Iterate through the array and keep track of the current sum and maximum sum seen so far.

• If the current sum becomes negative, reset it to 0 as it won't contribute to the maximum sum.

• Return the maximum sum as the result.

• Example: For input arr = [-2, 1, -3, 4, -1], the maximum subarray sum is 4.
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Q2. 
Add Two Numbers as Linked Lists
You are given two singly linked lists, where each list represents a positive number without any leading zeros.
Your task is to add these two numbers and return the sum as ...read more
Ans. 
Add two numbers represented as linked lists and return the sum as a linked list.
• Traverse both linked lists simultaneously while keeping track of carry

• Create a new linked list to store the sum

• Handle cases where one list is longer than the other

• Consider edge cases like carry at the end of addition
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Round duration - 15 minutes
Round difficulty - Easy

It was a normal discussion about the role, the job expectations and about the company culture.

Online one and half hours

Q1. Basic java sql python
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Q1. Introduction,family background,why you want to join our company.
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It was a screening round where questions where from java springboot and micro services

Q1. What are the java 8 features
Ans. 
Java 8 introduced several new features including lambda expressions, streams, functional interfaces, and more.
• Lambda expressions allow you to write code in a more concise and readable way.

• Streams provide a new way to work with collections in a functional style.

• Functional interfaces enable the use of lambda expressions.

• Default methods allow interfaces to have method implementations.

• Method references provide a way to ref...read more
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Q2. Why do we need to overide equals and hashcode
Ans. 
To ensure correct behavior when using objects in collections like HashMap or HashSet.
• Ensures that two objects that are equal have the same hash code.

• Prevents duplicate objects in collections like HashSet.

• Allows for correct retrieval of objects from collections like HashMap.
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Q1. It was a managerial round so had questions related to it
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Q1. Salary negotiations where done on this round
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