Hexaware Technologies Software Engineer II Interview Questions and Answers

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
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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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Average to easy difficulty level.

Q1. Java code of string manipulation
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Q2. What is the Java code for various types of sorting algorithms?
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Q3. Sql query and topics related to joins.
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Q1. About yourself and family
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Q2. What do you know about the company?
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Q3. Can you provide examples of real-life scenarios where you handled conflicts with either a colleague or a manager?
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Q4. What actions would you take if your manager does not approve your product idea, and how would you attempt to persuade them?
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Topics on electronics and C programming

Q1. Questions on simple python programs and electronics basics
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Q2. Question on simple linked list
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Q3. Program for fibonacci seq
Ans. 
Program to generate Fibonacci sequence
• Start with two initial numbers, 0 and 1

• Add the previous two numbers to get the next number in the sequence

• Repeat this process to generate the Fibonacci sequence

• Example: 0, 1, 1, 2, 3, 5, 8, 13, ...
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Q4. Questions on mosfets
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Q1. Why you would like to join the company, and other questions
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Q1. What is Dependency Injection?
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Q2. How does angular components communicate with each other?
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Q3. How can you optimize a stored procedure in MSSQL?
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Q4. What is Kestrel in .net Core?
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Q1. Explain over all experience
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Q2. Asked question on Core and advance java topic
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Q1. Some advance topic of Java
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Q2. DSA
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Q1. Salary expectation
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Q2. Relocation
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It was kind of difficult the coding part

They asked basic on going topic like impact of AI

Q1. Very much complex questions on cloud, oops, python and networks
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Q2. What is diffrent between linear and logestic regression
Ans. 
Linear regression is used for predicting continuous values, while logistic regression is used for predicting binary outcomes.
• Linear regression is used when the dependent variable is continuous and has a linear relationship with the independent variable.

• Logistic regression is used when the dependent variable is binary or categorical and the relationship between the independent variables and the outcome is non-linear.

• Lin...read more
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Q3. Certain questions on cloud
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