Celusion Technologies Interview Questions and Answers

Q1. Spring OOPS Hibernate
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Q2. Project More into Jquery
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Q1. Core Java Advance Java Spring MVC
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Q1. Questions based on java android android
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Q2. Explain four oops principal
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Four OOP principles are encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

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

• Polymorphism: Ability of different classes to be treated as instances of a common superclass.

• Abstraction: Hides the complex implementation details and only shows the necessa...read more
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Q3. Difference between abstract and interface
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Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and non-abstract methods.

• Interface can only have abstract methods and constants.

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

• Abstract classes are used to provide a common base for multiple classes, while interfaces define a...read more
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Q4. Android lifecycle
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Show user list with retrofit and using mvvm design patterns and jetpack library data binding

Q1. Salary discussion round
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Q1. What is mirror conatiner
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A mirror container is a duplicate container that reflects the changes made to the original container.
• Mirror containers are used for redundancy and failover purposes.

• Changes made to the original container are automatically replicated to the mirror container.

• Mirror containers can be used in high availability setups to ensure continuous operation.

• Example: Docker Swarm supports mirror containers for high availability.
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Q2. Explain middleware
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Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and work together.
• Middleware helps in integrating different systems and applications

• It provides a layer of abstraction for communication between components

• Examples include message brokers like RabbitMQ, web servers like Apache Tomcat, and API gateways like Kong
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Q1. What is dependency injection in. Net core
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Dependency injection in .NET Core is a design pattern that promotes loose coupling and enhances testability by injecting dependencies.
• Inversion of Control: Dependency injection is a form of Inversion of Control (IoC) where the control of object creation is transferred to a container.

• Service Registration: Services are registered in the Startup class using methods like AddSingleton, AddScoped, or AddTransient, defining t...read more
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Q2. Can we return a view from api controller merhod
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Returning a view from an API controller is not standard practice in ASP.NET MVC, as API controllers are meant for data responses.
• Separation of Concerns: API controllers are designed to return data (JSON/XML) rather than views, promoting a clear separation between data and presentation.

• Use of MVC Controllers: Instead of API controllers, use standard MVC controllers to return views, which are intended for rendering HTML.

• ...read more
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Q3. How to secure web api
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Securing a web API involves authentication, authorization, encryption, and input validation to protect data and resources.
• Use HTTPS to encrypt data in transit, preventing eavesdropping.

• Implement authentication mechanisms like OAuth 2.0 or JWT for user verification.

• Apply role-based access control (RBAC) to restrict access to resources.

• Validate and sanitize inputs to prevent SQL injection and XSS attacks.

• Use API keys to ...read more
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Q4. What is the difference between abstraction and Encapsulation
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Abstraction hides complexity by exposing only essential features, while encapsulation bundles data and methods in a single unit.
• Abstraction focuses on the 'what' of an object, like a car's interface (steering wheel, pedals) without revealing the internal mechanics.

• Encapsulation is about bundling data (attributes) and methods (functions) that operate on the data into a single unit, like a class in OOP.

• Example of Abstrac...read more
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