10+ Hes Water Engineers Interview Questions and Answers

Microservices are a software architecture design where applications are broken down into smaller, independent services that communicate with each other.

• Microservices are small, independent services that focus on specific business functions.

• Each microservice can be developed, deployed, and scaled independently.

• Intercommunication between microservices is typically done through APIs or messaging queues.

• Examples of intercommunication methods include RESTful APIs, gRPC, and messag...read more

Dependency injection is configured using a framework like Spring in Java projects.

• Dependency injection is configured using annotations like @Autowired in Spring framework.

• Beans are defined in configuration files like applicationContext.xml or using Java configuration classes.

• Dependencies are injected into classes at runtime by the framework.

• Constructor injection, setter injection, and field injection are common ways to inject dependencies.

Entity Framework is used as the ORM in the current project.

• Entity Framework is a popular ORM framework for .NET applications

• It provides a way to work with databases using .NET objects

• Supports LINQ queries for database operations

Constant keyword is used for compile-time constants, while readonly keyword is used for runtime constants.

• Constant keyword is used for values that are known at compile time and cannot be changed.

• Readonly keyword is used for values that are known at runtime and cannot be changed after initialization.

• Constants are implicitly static, while readonly fields are not.

• Constants are defined at the class level, while readonly fields can be defined at the instance level.

CQRS architecture separates read and write operations using Mediator pattern in .Net

• CQRS stands for Command Query Responsibility Segregation

• Mediator pattern helps in decoupling components by introducing a mediator object

• .Net MediatR library is commonly used for implementing Mediator pattern in CQRS architecture

Object is a static entity with predefined structure, while dynamic can change at runtime.

• Object is a class or data structure with fixed properties and methods

• Dynamic can change its properties or behavior during runtime

• Example: Object - Car class with properties like color, model. Dynamic - User input changing the color of a car object

OOPS stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• OOPS focuses on creating objects that contain both data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOPS.

• Example: In a car simulation program, a 'Car' object can have properties like 'color' and 'speed', and methods like 'accelerate' and 'brake'.

SQL program with joins

• Use JOIN keyword to combine rows from two or more tables based on a related column between them

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

Userform is a graphical interface for users to interact with data, while modules are containers for VBA code.

• Userform allows for creating custom forms with input fields, buttons, etc.

• Modules are used to store VBA code that can be called from other parts of the program.

• Userform can be used to collect user input and display information in a visually appealing way.

• Modules can contain functions, subroutines, and variables that can be accessed throughout the VBA project.