Visa Full Stack Developer Interview Questions and Answers

Q1. What are the java 1.8 features?
Ans. 
Java 1.8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with sequences of elements and perform operations on them.

• Default methods allow interfaces to h...read more
Answered by AI
Add your answer
Q2. Write program to print element sorting by using java 8 feature.
Ans. 
Program to print elements sorted using Java 8 features
• Use Stream API to sort the elements

• Use lambda expressions for sorting

• Use the sorted() method to sort the elements
Answered by AI
Add your answer

Q1. System design interview
Add your answer

Q1. What is react and why are we using it
Ans. 
React is a JavaScript library for building user interfaces.
• React allows for building reusable UI components

• It uses a virtual DOM for efficient updates

• React is declarative, making it easier to reason about code

• It is widely used in web development for its performance and flexibility
Answered by AI
Add your answer
Q2. What is redux in react
Ans. 
Redux is a predictable state container for JavaScript apps.
• Redux is a state management library for React

• It helps in managing the state of the application in a predictable manner

• It follows a unidirectional data flow pattern

• It has three main components: store, actions, and reducers

• Store holds the state of the application

• Actions are plain JavaScript objects that describe what happened

• Reducers specify how the application's...read more
Answered by AI
Add your answer

Create a react app with redux

Q1. Lazy loading and eager loading in Java in context of Singleton class
Ans. 
Lazy loading defers the initialization of an object until it is actually needed, while eager loading initializes the object immediately.
• Lazy loading is commonly used in Singleton pattern to delay the creation of the instance until it is requested.

• Eager loading initializes the Singleton instance at the time of class loading.

• Lazy loading can help improve performance by only creating the instance when needed, while eager ...read more
Answered by AI
Add your answer
Q2. Connect master and slave instances of a DB in spring boot project
Ans. 
Use Spring Boot configuration to connect master and slave instances of a DB
• Configure multiple data sources in application.properties or application.yml file

• Use @Primary annotation for the master data source and @Qualifier annotation for the slave data source

• Define separate DataSource, JdbcTemplate, and EntityManager beans for each data source

• Use @Transactional annotation with the appropriate data source to specify whic
Answered by AI
Add your answer
Q3. Global Exception handler in Spring boot
Ans. 
Global exception handler in Spring Boot handles all exceptions thrown by the application.
• Global exception handler can be implemented using @ControllerAdvice annotation in Spring Boot.

• It allows centralized exception handling for all controllers in the application.

• You can define methods annotated with @ExceptionHandler to handle specific exceptions.

• Global exception handler can return custom error responses or redirect to
Answered by AI
Add your answer

Q1. Basics of angular, ts,js
Add your answer

Q1. Programming questions
Add your answer

Q1. Family backgroud
Add your answer

Time ,speed ,distance

Java application using oops concept

Q1. Inheritance , oops
Add your answer

Q1. Tell me about urself
Add your answer

Q1. Array basics, java basics oops and all
Add your answer

Java 8, Mysql, sprin, c, c++

Q1. Questions based on core java and oops concepts
Add your answer