HCL Group Technical Lead Interview Questions, Process, and Tips

Q1. Expalin about Dependency Injection Princple
Ans. 
Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for easier testing by mocking dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Example: Constructor injection, Setter injection, Interface injection
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Q2. Types of LifeTime Scopes of Depedendy Injection Principle and UseCases
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There are three types of LifeTime Scopes in Dependency Injection: Transient, Scoped, and Singleton.
• Transient: Objects are created each time they are requested.

• Scoped: Objects are created once per request.

• Singleton: Objects are created only once and shared across the application.
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Q3. If you have a complex Stored Procedures which are required to be called for certain Validation Which one you chose, ADo.net or Entity Framework Core
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Q4. Share the screen and show how to implement DIP in .net core
Ans. 
Implementing DIP in .NET Core
• Create an interface for the dependency

• Implement the interface in a separate class

• Inject the dependency into the consuming class

• Use dependency injection container to resolve dependencies
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Q5. Explain about CTE
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CTE stands for Common Table Expressions, a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.
• CTEs are defined using the WITH keyword in SQL.

• They can improve readability and maintainability of complex queries.

• CTEs can be recursive, allowing for hierarchical data querying.

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte;

• Example: WITH RECURSIVE cte AS (SELECT...read more
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Q6. Difference between ABstact Classes and Interface
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Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract classes can have constructors, fields, and methods, while interfaces cannot.

• A class can only extend one abstract class, but it can implement multiple interfaces.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for classes to implem...read more
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Good questions from different topics like quant, apti

2 coding questions data structure based.

SQL- Joins, Subqueires

SQL - Joins, Sub queries, window functions

Q1. Explain about Past experience
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Q2. Current CTC and Expected CTC
Ans. 
Current CTC is confidential. Expected CTC is based on market standards and my experience.
• Current CTC is confidential information and not typically shared during interviews.

• Expected CTC is based on market standards, industry trends, and my level of experience.

• I am open to discussing compensation based on the responsibilities and expectations of the role.
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Q1. Good Java stuff related questions
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Q2. What are object oriented priciples
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Object oriented principles are a set of programming concepts that focus on objects and their interactions.
• Encapsulation - bundling data and methods that operate on that data within a single unit

• Inheritance - creating new classes from existing ones, inheriting their properties and methods

• Polymorphism - ability of objects to take on many forms, allowing for flexibility and extensibility

• Abstraction - hiding implementation...read more
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Q3. What are compile and run time polymorphism
Ans. 
Compile time polymorphism is achieved through function overloading and templates, while run time polymorphism is achieved through virtual functions and inheritance.
• Compile time polymorphism is resolved at compile time, while run time polymorphism is resolved at run time.

• Function overloading is an example of compile time polymorphism, where multiple functions with the same name but different parameters are defined.

• Templ...read more
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Q4. What are compile and run time polytechnic
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Compile time polymorphism is method overloading while runtime polymorphism is method overriding.
• Compile time polymorphism is resolved at compile time while runtime polymorphism is resolved at runtime.

• Method overloading is an example of compile time polymorphism where multiple methods have the same name but different parameters.

• Method overriding is an example of runtime polymorphism where a subclass provides its own imp...read more
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Q5. What is compile and runtime polymorphism
Ans. 
Compile-time polymorphism is method overloading while runtime polymorphism is method overriding.
• Compile-time polymorphism is resolved at compile-time while runtime polymorphism is resolved at runtime.

• Method overloading is an example of compile-time polymorphism where multiple methods have the same name but different parameters.

• Method overriding is an example of runtime polymorphism where a subclass provides its own imp...read more
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