Blue Yonder Node JS Developer Interview Questions and Answers

Q1. Easy Questions - Oops Concept . real life examples Abstract Class Inheritance difference Final vs immutable Spring Concepts - dependency injection,about @autowired
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Q1. English Test - Speaking Fluent Eglish
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Java Coding Questions based on ArrayList, HashMap, etc.

Count distinct elements in given String.

Q1. Current Project architecture.
Ans. 
Our current project architecture follows a microservices design pattern with separate services for different functionalities.
• Microservices architecture with separate services for different functionalities

• Use of RESTful APIs for communication between services

• Containerization using Docker for easy deployment and scalability

• Implementation of service discovery and load balancing with tools like Kubernetes

• Use of message bro
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Q2. My role in project
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My role in the project was to develop and maintain Java applications to meet the project requirements.
• Developing Java applications based on project requirements

• Maintaining and updating existing Java code

• Collaborating with team members to ensure project success
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Q1. Java, sql ,springboot
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Q1. Dsa question, I don’t remember
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Q2. Check if the sentence is palindrome or not
Ans. 
To check if a sentence is a palindrome, compare it with its reverse form.
• Remove all non-alphanumeric characters and convert the sentence to lowercase.

• Reverse the sentence and compare it with the original sentence to check for palindrome.

• Example: 'A man, a plan, a canal, Panama' becomes 'amanaplanacanalpanama' after removing non-alphanumeric characters and converting to lowercase.
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Q1. Discussion was on Binary tree and tree traversal. Asked me to write binary tree complete program to insert amd traversal of binary tree with few changes on how to insert.
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Q2. In depth discussion on my experience my projects.
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions based on Spring.

Q1. What is Inversion of Control?
Ans. 
Inversion of Control is a design principle where the control flow of a program is inverted, with the framework controlling the flow.
• Inversion of Control allows for decoupling of components, making the code more modular and easier to maintain.

• Common examples of Inversion of Control include dependency injection and event listeners.

• Frameworks like Spring and Hibernate make use of Inversion of Control to manage object life
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Q2. What is dependency injection?
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Dependency injection is a design pattern in which the dependencies of an object are provided externally rather than created within the object itself.
• In dependency injection, the dependencies of an object are injected into it from an external source, typically a framework or container.

• This helps in achieving loose coupling between classes, making the code more modular and easier to maintain.

• There are three common types ...read more
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Q3. What is the difference between constructor injection and setter injection in dependency injection?
Ans. 
Constructor injection passes dependencies through a class constructor, while setter injection uses setter methods.
• Constructor injection is done by passing dependencies as parameters to the constructor.

• Setter injection involves calling setter methods to set the dependencies after the object is created.

• Constructor injection ensures that all required dependencies are provided at the time of object creation.

• Setter injectio...read more
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Q4. Can you explain the prototype scope in Spring?
Ans. 
Prototype scope in Spring creates a new instance of the bean every time it is requested.
• Prototype scope is used when a new instance of the bean is required for each request.

• It is not thread-safe, as a new instance is created for each request.

• Example: If a bean is defined with prototype scope, a new instance will be created every time it is injected or requested.
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Q5. What are the different types of advice in Spring AOP?
Ans. 
Types of advice in Spring AOP include before, after, around, after-returning, and after-throwing.
• Before advice: Executed before the method invocation.

• After advice: Executed after the method invocation, regardless of its outcome.

• Around advice: Wraps around the method invocation, allowing for custom behavior before and after.

• After-returning advice: Executed after the method successfully returns a value.

• After-throwing adv...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions based on Java and Spring.

Q1. What is the Java Executor Framework?
Ans. 
Java Executor Framework is a framework provided by Java for managing and executing tasks asynchronously.
• It provides a way to manage threads and execute tasks concurrently.

• It includes interfaces like Executor, ExecutorService, and ScheduledExecutorService.

• It allows for better control over thread management and task execution compared to manually managing threads.

• Example: Executors.newFixedThreadPool(5) creates a thread
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Q2. What are the advantages of design patterns in Java?
Ans. 
Design patterns in Java provide reusable solutions to common problems, improving code quality and maintainability.
• Promotes code reusability by providing proven solutions to common design problems

• Improves code maintainability by following established best practices

• Enhances code readability by providing a common language for developers to communicate design ideas

• Helps in creating scalable and flexible software architectu...read more
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Q3. What are the different states of entity instances?
Ans. 
Entity instances can be in new, managed, detached, or removed states.
• New state: when an entity is first created but not yet associated with a persistence context.

• Managed state: when an entity is being managed by a persistence context and any changes made to it will be tracked.

• Detached state: when an entity was previously managed but is no longer associated with a persistence context.

• Removed state: when an entity is mar
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Q4. How do you implement the Java Executor Framework?
Ans. 
The Java Executor Framework provides a way to manage and execute tasks asynchronously in Java applications.
• Create an instance of ExecutorService using Executors class

• Submit tasks for execution using execute() or submit() methods

• Handle the results of the tasks using Future objects

• Shutdown the ExecutorService when tasks are completed using shutdown() method
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Q5. What are the benefits of the Java Executor Framework?
Ans. 
The Java Executor Framework provides a way to manage and control the execution of tasks in a multithreaded environment.
• Allows for easy management of thread pools, reducing overhead of creating new threads for each task.

• Provides a way to schedule tasks for execution at a specific time or with a delay.

• Supports task cancellation and interruption.

• Facilitates handling of task dependencies and coordination between tasks.

• Offe...read more
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems

Reverse string code and reverse array code

Q1. Basic of java, pillar of oops, collection, exception handling etc.
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Q2. What isinheritance
Ans. 
Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Example: Class 'Car' can inherit from class 'Vehicle' and inherit properties like 'speed' and methods like 'drive()'
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Q3. What is encapsulation
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit, known as a class.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct modification from outside the class.

• Access to the data is provided through methods, which can enforce validation rules and ensure data integrity.

• Ex...read more
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Q4. What is polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with Dog and Cat subclasses. Both Dog and Cat can be treated as Animals.
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Q5. What is abstraction
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the user.
• Abstraction allows developers to focus on what an object does rather than how it does it

• It helps in reducing complexity and improving code readability

• Example: In Java, abstract classes and interfaces are used to achieve abstraction
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Q1. Core java basics
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Q2. Collections framework
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