Foundit Senior Software Engineer Interview Questions and Answers

Q1. Basics of c#,oops Init keyword Dependency injection for multiple classes with same interface
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Q1. Sql related questions likr cursor,views. .net wcf vs web api Rest vs restful
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Q1. String Interpolation and string related methods
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Q1. Find the duplicate in the string
Ans. 
Use a hash set to find duplicates in a string array
• Iterate through the array and add each element to a hash set

• If the element is already in the hash set, it is a duplicate
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Q2. Reverse the string
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Reverse a given string
• Create an empty string to store the reversed string

• Iterate through the original string from end to start and append each character to the new string

• Return the reversed string
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Q1. Basic definitions and project related queries
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It was a test to create a login page and connect to database

Q1. What is difference between interface and abstract class
Ans. 
Interface is a contract with no implementation, while abstract class can have some implementation.
• Interface cannot have any implementation, only method signatures

• Abstract class can have both abstract methods and concrete methods

• A class can implement multiple interfaces but can only inherit from one abstract class

• Interfaces are used to achieve multiple inheritance in Java
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Q2. What are main concepts of oops
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Main concepts of OOP include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the nec
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Q1. Overall spring boot related questions
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Q2. Java 8 stream api
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The level of test was mixture of easy and tough questions

Q1. Some analytics questions related to problem solving
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Q1. To describe about any recently watched movie
Ans. 
I recently watched the movie 'Inception'.
• Directed by Christopher Nolan

• Genre: Science fiction, Action, Thriller

• Starring Leonardo DiCaprio, Joseph Gordon-Levitt, Ellen Page

• The movie explores the concept of shared dreaming and subconscious manipulation

• It has mind-bending visuals and a complex plot
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Java code based on java 8 stream api

Q1. How to select event rows from the table using sql query?
Ans. 
To select event rows from a table using SQL query, use the SELECT statement with appropriate conditions.
• Use the SELECT statement to specify the columns you want to retrieve from the table.

• Use the FROM clause to specify the table from which you want to retrieve the rows.

• Use the WHERE clause to specify the conditions that the rows must meet to be selected.

• Example: SELECT * FROM events WHERE event_type = 'concert';
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Q2. What is the SOLID and explain in detail with examples?
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SOLID is a set of principles for designing software that is easy to maintain, understand, and extend.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes must be substitutable for their base types.

• I - Interface Segregation Principle: Clients shou...read more
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