10+ KGN XEROX Interview Questions and Answers

The question asks for programs on Java 8 and 11, multithreading, collections, design patterns, SOLID principles, Spring MVC and Boot, and REST API.

• Java 8 and 11 programs: Provide examples of programs written in Java 8 and 11.

• Multithreading: Discuss the concept of multithreading and provide examples of how it can be implemented in Java.

• Collections: Explain the different types of collections in Java and their usage.

• Design patterns: Discuss commonly used design patterns in softw...read more

I have worked with design patterns such as Singleton, Factory, Observer, and Strategy in my projects.

• Singleton pattern was used to ensure only one instance of a class is created.

• Factory pattern was used to create objects without specifying the exact class of object that will be created.

• Observer pattern was used to define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

• Strategy pattern wa...read more

CompletableFuture is a class introduced in Java 8 to represent a future result of an asynchronous computation.

• CompletableFuture can be used to perform tasks asynchronously and then combine their results.

• It supports chaining of multiple asynchronous operations.

• It provides methods like thenApply, thenCompose, thenCombine, etc. for combining results.

• Example: CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> 10);

OOPs concept is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.

• OOPs stands for Object-Oriented Programming

• It focuses on creating objects that interact with each other to solve a problem

• Encapsulation, inheritance, polymorphism, and abstraction are key principles of OOPs

• HashMap in Java is a data structure that stores key-value pairs

• It uses hashing to store and retrieve elements efficiently

• E...read more

Yes, I am able to work in hybrid mode which involves a combination of remote and on-site work.

• Experienced in collaborating with remote team members using communication tools like Slack, Zoom, and Jira

• Comfortable with switching between working on-site and remotely based on project requirements

• Adaptable to different work environments and able to maintain productivity in both settings

Creating an immutable class in Java using final fields and no setters.

• Use 'final' keyword for class fields to prevent modification.

• Provide a constructor to initialize all fields.

• No setter methods should be present.

• Override 'toString()', 'equals()', and 'hashCode()' for better usability.

• Example: public final class ImmutablePoint { private final int x; private final int y; ... }

Microservice architecture focuses on breaking down applications into smaller, independent services.

• Microservices are small, independent services that work together to form a complete application.

• Each microservice is responsible for a specific function or feature.

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

• Microservices communicate with each other through APIs.

• Scalability, fault tolerance, and flexibili...read more

Method references in Java 8 are a way to refer to methods or constructors without invoking them directly.

• Method references are shorthand notation for lambda expressions.

• They can be used to make code more concise and readable.

• There are four types of method references: static, instance, constructor, and arbitrary object.

• Example: list.forEach(System.out::println);

Caching is the process of storing data in a temporary storage area to reduce access time and improve performance.

• Caching helps in speeding up data retrieval by storing frequently accessed data closer to the user.

• It reduces the need to access the original source of data, saving time and resources.

• Examples of caching include browser caching, CDN caching, and database caching.