Image InfoSystems Interview Questions, Process, and Tips

Q1. What is a Spring Bean?
Ans. 
A Spring Bean is an object managed by the Spring IoC container, representing a component in a Spring application.
• Spring Beans are instantiated, configured, and managed by the Spring IoC container.

• They can be defined in XML configuration files or annotated with @Component, @Service, @Repository, etc.

• Beans can have different scopes: singleton (default), prototype, request, session, etc.

• Example: A service class annotated ...read more
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Q2. What is @Transactional
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@Transactional is an annotation in Spring that manages transaction boundaries for methods, ensuring data integrity.
• Used in Spring Framework to define transaction boundaries.

• Automatically rolls back transactions in case of runtime exceptions.

• Can be applied at the method or class level.

• Example: @Transactional public void saveData() { ... }

• Supports propagation behaviors like REQUIRED, REQUIRES_NEW, etc.
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Q3. What is Dependency Injection
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Dependency Injection is a design pattern that allows a program to achieve Inversion of Control by injecting dependencies into a class.
• Promotes loose coupling between classes, making code easier to manage and test.

• Facilitates easier unit testing by allowing mock dependencies to be injected.

• Commonly used in frameworks like Spring (Java) and Angular (JavaScript).

• Example: Instead of a class creating its own dependencies, t...read more
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Q4. What is Pagination and Sorting
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Pagination and sorting are techniques used to manage and organize large datasets for better user experience.
• Pagination divides a large dataset into smaller, manageable chunks or pages. For example, displaying 10 items per page.

• Sorting arranges data in a specific order, such as ascending or descending. For example, sorting a list of names alphabetically.

• Pagination improves performance by loading only a subset of data at...read more
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Q5. What is IOC containert
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An IoC container manages object creation and dependencies, promoting loose coupling in software design.
• Inversion of Control (IoC) is a design principle that transfers the control of object creation to a container.

• IoC containers manage the lifecycle of objects, including instantiation, configuration, and destruction.

• Common IoC containers include Spring (Java), Unity (C#), and Angular's dependency injection.

• Example: In S...read more
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