Blue Yonder Full Stack Developer Interview Questions and Answers

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...read more
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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?
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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 ...read more
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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...read more
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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
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Q3. What is encapsulation
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Q4. What is polymorphism
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Q5. What is abstraction
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Q1. Dsa question, I don’t remember
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Q2. Check if the sentence is palindrome or not
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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.
Ans. 
A complete Java program for inserting and traversing a binary tree with customizable insertion logic.
• Binary Tree Node Class: Create a class 'Node' with properties for value, left, and right children.

• Insertion Method: Implement a method to insert nodes based on specific criteria (e.g., value comparison).

• Traversal Methods: Include methods for in-order, pre-order, and post-order traversal.

• Example Insertion: If inserting 5...read more
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Q2. In depth discussion on my experience my projects.
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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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Medium data structure problem was given and asked to solve. System design questions was asked.

Medium data structure problem was asked. Java questions were asked and previous projects were discussed.

Q1. System Design question was asked. Java concepts were asked.
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Q2. Java Concepts were asked.
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Q3. Previous projects were discussed.
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Q1. Previous projects were discussed. Roles and responsibilities were discussed.
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Q1. Reverse a string without any library function.
Ans. 
Reverse a string without any library function.
• Create an empty string to store the reversed string

• Loop through the original string from end to start

• Append each character to the empty string

• Return the reversed string
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Q2. About current project and it's architecture. Challenges you've faced in current project and how did you've solved it. Basic of OOPS
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Q1. Personality check, tell me something about yourself which is not there in CV
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Q1. Core deep concepts of c++ and few basic coding questions
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