Moolya Software Testing Java Developer Interview Questions and Answers

Round duration - 50 minutes
Round difficulty - Medium

Round duration - 20 minutes
Round difficulty - Medium

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Ans. 
Given an array and a target sum, find pairs of elements that add up to the target sum.
• Iterate through the array and for each element, check if the complement (target sum - current element) exists in a hash set.

• If the complement exists, add the pair to the result list. Otherwise, add the current element to the hash set.

• Sort the pairs based on the first element and then the second element to meet the required output form
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Round duration - 20 minutes
Round difficulty - Easy

Round duration - 40 minutes
Round difficulty - Hard

Q1. Can you provide an example of how to use pointers in C/C++ and discuss different concepts related to them?
Ans. 
Pointers in C/C++ are variables that store memory addresses. They are used to manipulate memory directly and improve performance.
• Pointers are declared using an asterisk (*) before the variable name.

• Pointers can be used to dynamically allocate memory using functions like malloc() and free().

• Pointers can be used to pass variables by reference to functions.
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Basic dsa questions , basic recursion questions of trees ,graphs and searching algorithms there are some mcq questions that too on dsa

They asked few sql and dsa questions like a open board test

Q1. Sort a vector according to other other vector ?
Ans. 
Sort a vector based on another vector
• Use std::sort with a custom comparator function

• The comparator function should compare the indices of the elements in the second vector

• The first vector should be sorted based on the order of the indices in the second vector
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Q2. String processing question where we need to process a string by using given instructions .
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Leetcode easy, medium

Q1. Cpp , dsa , os, cn, coa
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Q2. Sort 0,1,2 array
Ans. 
Sort an array of strings containing '0', '1', and '2'.
• Use counting sort algorithm to count the occurrences of '0', '1', and '2'.

• Create a new array with the sorted counts of '0', '1', and '2'.

• Join the sorted array back into a single array of strings.
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Q1. Why should we hire you?
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Q1. Opps interview questions
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Q2. Some of the interview question base on mysql and collecections
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Easy to medium prepare concepts like time-based concepts

Machine test was given for 30mins

Q1. Event loop and its operations
Ans. 
Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for events and executing associated callbacks.
• Event loop is commonly used in JavaScript to handle asynchronous operations.

• It continuously checks the call stack for any pending tasks and executes them in a non-blocking manner.

• Event loop allows for efficient handling of I/O operations without blocking the main...read more
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Q2. Mssql query for group bu
Ans. 
Use GROUP BY clause in MSSQL to group data based on a specific column.
• Use GROUP BY followed by the column you want to group by

• Can be used with aggregate functions like COUNT, SUM, AVG, etc.

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name
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General on Online editors

Q1. Find the first occurrence of an element in an rotated array.
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Pattern question based on Alphabets