Precisely Interview Questions and Answers

A linked list is a linear data structure where elements are stored in nodes that have a reference to the next node in the sequence.

• Consists of nodes connected by pointers or references

• Each node contains data and a reference to the next node

• Can be singly linked (each node points to the next) or doubly linked (each node points to the next and previous)

• Example: Singly linked list: 1 -> 2 -> 3 -> 4 -> null

• Example: Doubly l...read more

Linked lists are dynamic data structures that consist of nodes, each containing data and a reference to the next node.

• A linked list consists of nodes, where each node has data and a pointer to the next node.

• Types of linked lists: singly linked list, doubly linked list, and circular linked list.

• Example of a singly linked list: Node1 -> Node2 -> Node3 -> NULL.

• In a doubly linked list, each node points to both the...read more

InjectMocks is used to inject mocks into a test class, while MockBean is used to mock Spring beans in a Spring context.

• InjectMocks is a Mockito annotation used to inject mock objects into a test class.

• MockBean is a Spring Boot annotation used to mock Spring beans in a Spring context.

• InjectMocks is used in standalone tests, while MockBean is used in integration tests.

• Example: @InjectMocks private UserService userService...read more

Circuit breaker pattern is a design pattern used in software development to prevent cascading failures in distributed systems.

• It is used to handle faults and failures in a distributed system by temporarily blocking requests to a failing service.

• When the circuit breaker detects that the service is healthy again, it allows requests to flow through.

• It helps in improving the resilience and fault tolerance of the system.

• Exa...read more

Implementing resiliency in microservice architecture involves using techniques like circuit breakers, retries, timeouts, and load balancing.

• Use circuit breakers to prevent cascading failures by stopping requests to a service that is not responding.

• Implement retries with exponential backoff to handle transient failures and give the service time to recover.

• Set timeouts for requests to avoid blocking resources and waiting...read more

Docker allows for easy and efficient containerization of applications, leading to improved scalability, portability, and resource utilization.

• Improved scalability: Docker containers can be easily scaled up or down based on demand, allowing for efficient resource allocation.

• Portability: Docker containers can run on any system that supports Docker, making it easy to deploy applications across different environments.

• Resou...read more