VAJRA IOT PRIVATE LIMITED Interview Questions and Answers

Java is a high-level programming language known for its platform independence and object-oriented approach.

• Java is widely used for developing desktop, web, and mobile applications.

• It is known for its robustness, security, and scalability.

• Java programs are compiled into bytecode that can run on any Java Virtual Machine (JVM).

• It supports multithreading, exception handling, and automatic memory management.

• Popular framewor...read more

Collections are data structures that store and manipulate groups of objects.

• Collections provide a way to organize and manage large amounts of data

• They can be used to perform operations on groups of objects, such as sorting or searching

• Examples of collections include arrays, lists, sets, and maps

Java 8 introduces lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow functional programming in Java

• Functional interfaces enable the use of lambda expressions

• Streams provide a concise way to perform operations on collections

• Default methods allow interfaces to have implementation

• Date and Time API improvements

• Nashorn JavaScript engine

Spring Boot is a framework for building standalone, production-grade Spring-based applications.

• Spring Boot simplifies the process of creating and deploying Spring-based applications.

• It provides a pre-configured environment with a set of opinionated defaults.

• It includes embedded servers like Tomcat, Jetty, and Undertow.

• It supports a wide range of data sources and data access technologies.

• It enables easy integration with...read more

JPA stands for Java Persistence API, a specification for object-relational mapping in Java applications.

• JPA is used to map Java objects to relational database tables.

• It provides a set of annotations to define the mapping between Java classes and database tables.

• JPA also supports querying data using the Java Persistence Query Language (JPQL).