HCL Group Java Developer Interview Questions and Answers

Q1. Transactions in springboot
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Transactions in Spring Boot manage database operations as a single unit of work to ensure data integrity.
• Spring Boot provides support for declarative transaction management using @Transactional annotation.

• Transactions can be configured at class or method level.

• Transactions can be rolled back in case of exceptions to maintain data consistency.

• Example: @Transactional annotation on a service method ensures that all databa...read more
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Q2. Difference between arraylist and linked list
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Q3. How REST API used
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REST API is used to communicate between client and server using HTTP methods like GET, POST, PUT, DELETE.
• REST API allows clients to access and manipulate resources on a server using standard HTTP methods.

• It uses URLs to identify resources and HTTP methods to perform actions on those resources.

• Common HTTP methods used in REST API are GET (retrieve data), POST (create data), PUT (update data), DELETE (remove data).

• REST A...read more
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Q4. Annotations in springboot
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Annotations in Spring Boot are used to provide metadata about the application and its components.
• Annotations are used to configure Spring Boot applications, define beans, handle requests, etc.

• Examples include @SpringBootApplication, @RestController, @Autowired, @RequestMapping, etc.
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Q5. Features of java 8
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Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods in interfaces.
• Lambda expressions allow for more concise code and enable functional programming.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with collections of objects in a functional style.

• Default methods in interfaces ...read more
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Q6. How interface is implemented in java
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Interfaces in Java are implemented using the 'implements' keyword, allowing classes to provide specific implementations for methods defined in the interface.
• Interfaces in Java define a contract for classes to implement, specifying method signatures without implementations.

• A class can implement multiple interfaces by separating them with commas.

• Classes implementing an interface must provide concrete implementations for ...read more
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Q7. How stream API works
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Q8. Benefits of springboot over spring
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Q9. Difference between throw and throwable
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Q1. Good interview in java
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Q2. Good interview in java1
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Q1. Ctc discussion also fine
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Q2. Ctc discussion also fine1
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Q1. Basic Java Question on Streams Understanding of your current project. How you projects works end to end. Spring Boot basic knowledge. You should be able explain your project and your roles and responsibili...read more
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Java MCQ questions

Q1. Knowledge on Java language
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