Software Engineer Java/J2ee Spring Hibernate Interview Questions and Answers for Freshers

Explaining marker interfaces, Singleton design pattern, and immutability of strings

• Marker interfaces are interfaces with no methods, used to mark a class as having a certain behavior or capability

• Singleton design pattern ensures only one instance of a class is created and provides a global point of access to it

• Strings are immutable in Java to ensure their values cannot be changed once created, which improves security and performance

• Immutable objects are thread-safe and can be...read more

Microservice architecture is a software design pattern where an application is divided into small, independent services.

• Benefits of microservice architecture:

• - Scalability: Each service can be scaled independently, allowing for better performance and resource utilization.

• - Flexibility: Services can be developed, deployed, and updated independently, enabling faster development cycles.

• - Fault isolation: If one service fails, it doesn't affect the entire application.

• - Technology...read more

Spring Boot is an opinionated framework that simplifies Spring development.

• Spring Boot provides auto-configuration and embedded servers.

• Spring Boot reduces boilerplate code and configuration.

• Spring Boot is ideal for microservices and standalone applications.

• Spring provides a more flexible and customizable framework.

• Spring requires more configuration and setup.

• Spring is ideal for large-scale enterprise applications.

Java 8 introduced new features like lambda expressions, functional interfaces, and Stream API.

• Lambda expressions allow functional programming in Java.

• Functional interfaces are interfaces with a single abstract method.

• Stream API provides a functional way of processing collections.

• Default methods allow adding new methods to interfaces without breaking existing implementations.

• Date and Time API provides a more comprehensive way of handling date and time.

• Nashorn JavaScript engine...read more