Supermoney (GetClarity Fintech Services) Junior Java Developer Interview Questions and Answers

A marker interface is an interface with no methods used to mark a class as having a certain property or behavior.

• Marker interfaces are used to provide metadata about a class.

• They are often used in frameworks and libraries to indicate that a class should be treated in a certain way.

• Examples include Serializable, Cloneable, and Remote interfaces in Java.

• Marker interfaces can also be used to enforce design patterns, such ...read more

Classes, variables, and objects are stored in different areas of JVM's memory.

• Classes are stored in the method area of JVM's memory.

• Variables are stored in the stack or heap depending on their scope and lifetime.

• Objects are stored in the heap area of JVM's memory.

• Static variables are stored in the method area.

• Local variables are stored in the stack.

• Instance variables are stored in the heap.

• Primitive data types are stor...read more

Design patterns like API Gateway, Circuit Breaker, Service Registry, and Service Discovery are commonly used in Microservice architecture.

• API Gateway pattern is used to provide a single entry point for all clients to access the microservices.

• Circuit Breaker pattern is used to prevent cascading failures in microservices.

• Service Registry pattern is used to keep track of all the available services in the microservice arch...read more

Kafka is a distributed streaming platform used for building real-time data pipelines and streaming applications.

• Kafka is used for building real-time data pipelines and streaming applications

• Kafka Streams is a client library for building applications and microservices that process streams of data

• Kafka provides fault-tolerant storage and processing of streams of records

• Kafka Streams allows for stateful and stateless proc...read more