Hexaware Technologies Software Engineer II Interview Questions and Answers

2 coding and aptitude

Q1. All java based questions
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Q1. All java based questions
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Q1. To find sum of even numbers from given arraylist using stream api
Ans. 
Using stream API to find the sum of even numbers from an ArrayList
• Convert the ArrayList to a stream using the stream() method

• Filter the stream to keep only the even numbers using the filter() method

• Use the mapToInt() method to convert the stream of even numbers to an IntStream

• Finally, use the sum() method to calculate the sum of the even numbers
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Q2. Oops ,java 8 concepts,exceptions,project discussions
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Q3. Which interface used to prevent SQL injection
Ans. 
Prepared Statements interface is used to prevent SQL injection.
• Prepared Statements interface is used to parameterize the SQL queries.

• It allows the separation of SQL code and user input.

• It helps to prevent SQL injection attacks by automatically escaping special characters.

• Examples: PDO, mysqli, Java PreparedStatement, etc.
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Q4. Why string is imutable
Ans. 
String is immutable to ensure data integrity and thread safety.
• Immutable strings prevent accidental modification of data.

• Immutable strings allow for efficient memory allocation and sharing.

• Immutable strings ensure thread safety by avoiding race conditions.

• Examples of immutable string methods include substring, toLowerCase, and toUpperCase.
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Q5. Java oops concept and example each type
Ans. 
Java OOPs concepts and examples
• Encapsulation - hiding data and methods within a class (e.g. private variables)

• Inheritance - creating new classes from existing ones (e.g. subclass extends superclass)

• Polymorphism - using a single method to perform different actions (e.g. method overloading/overriding)

• Abstraction - focusing on essential features and hiding implementation details (e.g. abstract classes/interfaces)
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You will be asked to develop an application and based on that the next round will be proceeded. For me I have been asked to perform some crud operations with api using asp.net core and asp.net mvc application

Q1. What is api and why do we use it
Ans. 
API is a set of protocols and tools for building software applications. It allows different applications to communicate with each other.
• API stands for Application Programming Interface

• It defines how different software components should interact with each other

• APIs can be used to access data or functionality from other applications or services

• Examples of APIs include Google Maps API, Twitter API, and Facebook API
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Q2. Difference between interface and abstract class
Ans. 
Interface defines only method signatures while abstract class can have method implementations.
• An interface can be implemented by multiple classes while an abstract class can only be extended by one class.

• An abstract class can have constructors while an interface cannot.

• An abstract class can have instance variables while an interface cannot.

• An abstract class can provide default implementations for some methods while an ...read more
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Q3. How routing is performed in asp.net core api
Ans. 
Routing in ASP.NET Core API is performed using the built-in middleware called Endpoint Routing.
• Endpoint Routing is responsible for mapping incoming requests to the appropriate action methods in the controller.

• It uses the HTTP verb, URL pattern, and route data to determine the correct action method.

• Routes can be defined using attributes on the controller and action methods or in the Startup.cs file.

• Middleware like authe...read more
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Q4. What are solid principles
Ans. 
SOLID principles are a set of design principles for writing maintainable and scalable software.
• S - Single Responsibility Principle

• O - Open/Closed Principle

• L - Liskov Substitution Principle

• I - Interface Segregation Principle

• D - Dependency Inversion Principle
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Q1. Why are you switching to this job
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Q2. What is your salary expectations
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Basic aptitude questions held online with their portal

Broad coding and basic oops

Q1. About hr questions
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Q1. Please don’t join Fujitsu, They won’t assisgn u project soon, Chances if Termination
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Q1. All technical questions
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Q2. Technical Rounds
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Q1. What is Linux, how will you add the commands
Ans. 
Linux is an open-source operating system based on Unix. Commands can be added using the terminal or by installing packages.
• Linux is free and can be customized to suit specific needs

• Commands can be added using the terminal by creating a script or alias

• Packages can be installed using package managers like apt-get or yum

• Examples of commands include ls, cd, mkdir, rm, etc.
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Round duration - 90 minutes
Round difficulty - Medium

2 Programing Questions and 30 MCQs. 
Programing questions were medium with one being array manipulation and other being graph based. 

MCQ were from OOPs concepts, SQL, Operating System and Network, prepare in depth knowledge for all the topics.

Q1. 
Count Pairs Problem Statement
You are given an array A of length N consisting only of integers. Additionally, you are provided with three integers X, Y and SUM. Your task is to count the number of pairs (...read more
Ans. 
Using HashMap or self balancing BST for fastest result.
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Q2. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
Ans. Brute Force
In the brute force approach, we will use two nested loops. The outer loop is used to select the starting index of the substring and the inner loop is used to fix the ending index of the substring. After selecting the substring, we will use another loop (or a method) to check whether the substring contains all unique characters or not using a HashSet.
Space Complexity: O(n)Explanation:
O(L), where L is the len...read more
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Round duration - 90 minutes
Round difficulty - Medium

Questions on SQL and DBMS were asked in this round

Q1. What are the ACID properties in DBMS?
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Q2. Can you explain the different levels of data abstraction in a DBMS?
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Q3. What are constraints in SQL?
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Round duration - 30 minutes
Round difficulty - Medium

HR round was pretty much a casual conversation about why optum, work location, joining availablity and what qualities you would like to highlight about yourself.

Q1. Why do you want to work at Optum, and what qualities would you like to highlight?
Ans. 
Tip 1 : Go through wiki page or google about the working of the company
Tip 2 : Qualities should more aligned to the company's values.
Tip 3 : Show your interest in working with the organisation and how will you contribute to the team.
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Aptitude and resoninh test
Coding test ,

Coding test,coding skills in all languages

Q1. Brief Introduction and approach to insert tabular data in database.
Ans. 
To insert tabular data in a database, use SQL INSERT statement with appropriate table and column names.
• Use SQL INSERT statement to insert data into a table

• Specify the table name and column names in the INSERT statement

• Provide the values to be inserted for each column

• Ensure the data types of values match the column types

• Consider using prepared statements or parameterized queries for security

• Example: INSERT INTO employee
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