Softpark 21 DOT NET Programmer Interview Questions and Answers

Technology advantage or not

All aptitude topics,logical reasoning

Q1. Oops,2 coding questions
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Q2. Palindrome,even number
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Q1. What do you know
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Q2. Do you have any questions
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Q1. What is Dependency Injection?
Ans. 
Dependency Injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
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Q2. How to handle exception in java
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In Java, exceptions can be handled using try-catch blocks to catch and handle specific exceptions.
• Use try-catch blocks to catch exceptions and handle them gracefully

• Use multiple catch blocks to handle different types of exceptions

• Use finally block to execute code regardless of whether an exception is thrown or not

• Throw custom exceptions using throw keyword
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Q1. In Java8, different between flatmap and map
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map transforms each element in a stream, while flatMap transforms each element into multiple elements
• map applies a function to each element in a stream and returns a new stream of the results

• flatMap applies a function that returns a stream for each element in the original stream, then flattens the streams into a single stream

• Example: map - stream.map(x -> x * x), flatMap - stream.flatMap(str -> Arrays.stream(str.split(
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Q2. How to handle the ConcureentModificationException
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ConcurrentModificationException occurs when a collection is modified while iterating over it.
• Use Iterator to iterate over the collection instead of foreach loop.

• If modification is necessary, use Iterator's remove() method instead of collection's remove() method.

• Consider using synchronized collections or ConcurrentHashMap to avoid ConcurrentModificationException.
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Q1. Difference between linked list and array list
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Linked list is a data structure where elements are stored in nodes with pointers to the next node. Array list is a dynamic array that can grow or shrink in size.
• Linked list allows for efficient insertion and deletion of elements anywhere in the list.

• Array list provides fast access to elements using index, but slower insertion and deletion compared to linked list.

• Example: Linked list - 1 -> 2 -> 3 -> 4 -> 5, Array list
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Q2. Difference between @controller and @ Rest controller
Ans. 
The @Controller annotation is used for traditional MVC controllers, while @RestController is used for RESTful web services.
• The @Controller annotation is used to define a class as a Spring MVC controller, which can handle HTTP requests and return a view.

• The @RestController annotation is used to define a class as a controller for RESTful web services, which can handle HTTP requests and return data in JSON or XML format.

• T...read more
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Q1. Why do you want to switch
Ans. 
I want to switch to explore new technologies and challenges in a different industry.
• Interested in learning new skills and technologies

• Seeking new challenges and opportunities for growth

• Want to explore different industry perspectives
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Q2. Salry expectations
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Q1. Question on oop concepts
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Q2. Coding questions
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Q1. Basic core Java question.
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Q1. Abstract class vs interfaces. What would i choose and why.
Ans. 
Abstract class is used when there is a need for default implementation, while interfaces are used for multiple inheritance.
• Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• Abstract classes can provide default implementations for methods, while interfaces cannot.

• Interfaces allow a class to implement multiple interfaces, but can only inherit from one abstra...read more
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Q2. Difference between .NET core, .NET framework and .NET
Ans. 
NET core is a cross-platform, open-source framework for building modern, cloud-based, internet-connected applications. NET framework is a Windows-only framework for building Windows desktop applications. NET is a general term encompassing both .NET core and .NET framework.
• NET core is cross-platform and open-source, while .NET framework is Windows-only.

• .NET core is modular and lightweight, allowing for faster performanc...read more
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Q3. Pipelines and Middlewares in .NET. How would i configure them.
Ans. 
Pipelines and Middlewares in .NET are used for request processing and can be configured using middleware components.
• Pipelines in .NET are used to define a series of middleware components that process an HTTP request.

• Middlewares are components that can handle requests and responses in the pipeline.

• To configure pipelines and middlewares in .NET, you can use the 'UseMiddleware' method in the 'Configure' method of the Star...read more
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Q4. Difference between App.Use() and App.Run()
Ans. 
App.Use() is used for adding middleware to the request pipeline, while App.Run() is used for handling the request directly.
• App.Use() is used to add middleware components to the request pipeline.

• App.Run() is used to handle the request directly without passing it to the next middleware component.

• App.Use() is typically used for setting up middleware like authentication, logging, etc.

• App.Run() is used for handling the fina...read more
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Q5. SOLID principles (S and O was asked)
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Q6. Dependency Inversion vs Inversion of Control. I had to write examples of constructor injection, method injection with the help of a DBContext file.
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Q7. String vs String Builder. Comparision of their mutability, speed, memory allocated, usability. Was provided a use case and asked which one to use and how. String Interpolation. String Manipulation.
Ans. 
String is immutable, while StringBuilder is mutable. StringBuilder is faster and more memory efficient for string manipulation.
• String is immutable, meaning once created, it cannot be changed. StringBuilder is mutable, allowing for efficient string manipulation.

• StringBuilder is faster than String for concatenating multiple strings, as it does not create a new string object each time.

• String uses more memory as it creates...read more
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Q8. Database Normalization (2NF was asked). Was given an sample dataset, asked to normalize and eliminate partial dependency. Given 2 entities Students and Class, establish relationships between them and prepa...read more
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Q9. Difference between Unique, Primary Key. Clustered and Non-Clustered Indices.
Ans. 
Unique, Primary Key, Clustered, and Non-Clustered Indices are all used in database management to enforce data integrity and improve query performance.
• Unique constraint ensures that all values in a column are unique, but allows NULL values.

• Primary Key constraint ensures that all values in a column are unique and not NULL. Each table can have only one Primary Key.

• Clustered Index physically reorders the way records in the...read more
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Q10. Prepare an example of JWT authentication and Oauth for an API.
Ans. 
JWT authentication and OAuth example for API
• Implement JWT authentication by generating a token upon user login and including it in the Authorization header of API requests

• Use OAuth for user authorization by obtaining access tokens from a third-party provider like Google or Facebook

• Ensure API endpoints validate JWT tokens and OAuth access tokens before allowing access to resources
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Q11. Difference between $.post and $.ajax.
Ans. 
Both $.post and $.ajax are methods in jQuery used for making AJAX requests, but $.ajax is more versatile and customizable.
• Both $.post and $.ajax are used for making AJAX requests in jQuery.

• $.post is a shorthand method for $.ajax with predefined settings for POST requests.

• $.ajax is more versatile and customizable, allowing for different types of requests and more options.

• Example: $.post('example.php', {data: 'example'},...read more
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Q12. Write a Linq query to fetch data the fastest.(i used iQueryable) Write a Linq query to check if a record exists in the table.(i used ANY)
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Q1. Thread,oops,sql,find character count
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