CALLISTO INFOSOLUTIONS Interview Questions and Answers for Experienced

Service provides data and functionality while Component handles UI and user interaction.

• Service is a singleton object that can be injected into multiple components

• Component is a directive with a template and styles

• Service provides data and functionality to components

• Component handles UI and user interaction

• Services can be used to share data between components

• Components can communicate with services using dependency inj

State variables are best for managing component's internal state, while properties are best for passing data from parent to child components.

• State variables are mutable and can be changed within the component

• Properties are immutable and cannot be changed within the component

• State variables are used to manage the component's internal state

• Properties are used to pass data from parent to child components

• State variables ar...read more

Authentication system in API service must be configured securely to prevent external hacking.

• Use strong encryption algorithms to store passwords

• Implement multi-factor authentication

• Use HTTPS protocol to encrypt data in transit

• Implement rate limiting to prevent brute force attacks

• Regularly update and patch the authentication system

• Use secure coding practices to prevent injection attacks

Clients of one domain can access API service through authentication and authorization managed by API service.

• API service can use OAuth2.0 for authentication and authorization

• Different domains can have different client IDs and secrets for OAuth2.0

• API service can use JWT for token-based authentication

• Cross-Origin Resource Sharing (CORS) can be used to allow access from different domains

IDisposable is an interface used to release unmanaged resources.

• It is used to release unmanaged resources like file handles, database connections, etc.

• It has a single method called Dispose() which is used to release the resources.

• It is implemented by classes that use unmanaged resources and needs to be disposed of.

• Example: SqlConnection class implements IDisposable to release the database connection.

• Example: FileStream...read more

Dependency Injection is a design pattern that allows objects to receive dependencies rather than creating them internally.

• Dependency Injection is used to reduce tight coupling between software components.

• It allows for easier testing and maintenance of code.

• There are three types of Dependency Injection: Constructor Injection, Setter Injection, and Interface Injection.

• Frameworks like Spring and Angular provide built-in s

Concatenate the values in the given integer array with comma.

• Convert the integer array to string array using Arrays.toString()

• Use String.join() method to concatenate with comma

Interfaces and abstract classes are used for abstraction and defining contracts.

• Interfaces are a collection of abstract methods that define a contract for a class to implement.

• Abstract classes are classes that cannot be instantiated and can have both abstract and concrete methods.

• Interfaces can be implemented by multiple classes, while a class can only inherit from one abstract class.

• Interfaces are used for loose coupl...read more

No, abstract classes cannot be instantiated.

• Abstract classes are incomplete and cannot be instantiated on their own.

• They can only be used as a base class for other classes.

• Instantiation of an abstract class will result in a compile-time error.

• However, concrete classes that inherit from the abstract class can be instantiated.

SOLID is a set of principles for object-oriented programming to make software more maintainable and scalable.

• S - Single Responsibility Principle

• O - Open/Closed Principle

• L - Liskov Substitution Principle

• I - Interface Segregation Principle

• D - Dependency Inversion Principle

• Example: Using Single Responsibility Principle to separate UI and business logic

• Example: Using Open/Closed Principle to extend functionality without mo

We used the Model-View-Controller (MVC) design pattern in our application.

• MVC separates the application into three interconnected components: the model, the view, and the controller.

• The model represents the data and business logic of the application.

• The view displays the data to the user.

• The controller handles user input and updates the model and view accordingly.

• MVC promotes separation of concerns and modularity.

• Examp...read more

I am most interested in intellectual property law.

• I find the intersection of law and technology fascinating.

• I enjoy working with clients to protect their creative works and inventions.

• I am particularly interested in trademark law and the branding of products and services.

• I have experience in drafting patent applications and conducting patent searches.

• I am also interested in the emerging field of artificial intelligence

GPA is not always an accurate reflection of abilities.

• GPA only measures academic performance, not practical skills or experience.

• Some students may struggle with standardized testing or have personal issues that affect their grades.

• Employers often look for well-rounded candidates with extracurricular activities and work experience.

• However, a high GPA can demonstrate discipline, hard work, and intelligence.

• Ultimately, GP...read more

Windows PowerShell is a command-line shell and scripting language designed for system administration tasks.

• It is built on the .NET Framework

• It allows users to automate tasks using scripts

• It supports remote management of Windows machines

• It has a rich set of commands and utilities

• Example: Get-Process command retrieves information about running processes

• Example: Set-ExecutionPolicy command changes the PowerShell execution