AppInventiv Technologies Software Trainee Interview Questions and Answers

Hashmap is a data structure that stores key-value pairs and provides constant time complexity for insertion, deletion, and retrieval.

• Hashmap uses hashing function to map keys to indices in an array

• Collisions can occur when two keys map to the same index, which can be resolved using separate chaining or open addressing

• Java implementation: HashMap map = new HashMap<>()

Spring is a framework while Spring Boot is a tool that simplifies Spring application development.

• Spring Boot provides auto-configuration and embedded servers.

• Spring requires more configuration and setup.

• Spring Boot is opinionated and follows 'convention over configuration'.

• Spring Boot reduces boilerplate code.

• Spring Boot is ideal for microservices and standalone applications.

The type of controller in Spring is @Controller and the type of annotations are @RequestMapping and @ResponseBody.

• @Controller is used to mark a class as a Spring MVC controller.

• @RequestMapping is used to map a URL to a method in a controller.

• @ResponseBody is used to indicate that the return value of a method should be serialized and returned as the response body.

Junkins is not a known term in software engineering.

• Junkins is not a term used in software engineering.

• It is possible that the interviewer misspoke or meant to ask a different question.

• It is important to clarify any confusion or misunderstandings during an interview.