Blue Yonder Full Stack Developer Interview Questions and Answers

Q1. Just go through basic core java questions, spring boot questions.
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Q2. 1. Oops concept, Exception Handling, Singleton class
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Q1. 1. Find number of times a string occurs in second string. Practice more on string coding interview questions. 2. Sql:find employee who has second highest salary.
Ans. 
Count occurrences of a string in another string and find second highest salary in SQL.
• Use a loop to iterate through the second string and check for occurrences of the first string.

• Use a counter variable to keep track of the number of occurrences found.

• In SQL, use a subquery to find the employee with the second highest salary by ordering the salaries in descending order and selecting the second row.
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Q1. Discussed about roles and responsibilities. Greatest challenge that has faced in job role. Puzzle:u have 3l 5l container,how do u measure 4l using only two given containers
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Q1. Basic questions on oops, exception handling, spring boot annotations, collections
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Q1. Coding questions on Java 8 features, streams, lambdas as well
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Q1. This is was kind of managerial round. Goes with questions like what is your learning, why job switch, difficult part of your job and some puzzles as well
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Q1. Questions like self intro, fam background, why manhattan, what do you know about manhattan, package, strengths and weakness
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Q1. Basic DSA questions like binary search, pattern
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Q2. Basic SQL query questions
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round. The interviewer asked me some programming based questions and some questions on database management systems.

Q1. 
Sum of Maximum and Minimum Elements Problem Statement
Given an array ARR of size N, your objective is to determine the sum of the largest and smallest elements within the array.
Follow Up:
Can you achie...read more
Ans. 
Find the sum of the largest and smallest elements in an array with the least number of comparisons.
• Iterate through the array to find the maximum and minimum elements.

• Keep track of the maximum and minimum elements as you iterate.

• After iterating, sum up the maximum and minimum elements.

• To achieve the task with the least number of comparisons, compare elements in pairs.
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Q2. 
Binary Tree Construction from Parent Array
Construct a binary tree from a given array called parent where the parent-child relationship is determined by (PARENT[i], i), indicating that the parent of node ...read more
Ans. 
Construct a binary tree from a given parent array and perform level-order traversal.
• Iterate through the parent array to create the binary tree using a queue data structure.

• Keep track of the parent-child relationships and construct the tree accordingly.

• Perform level-order traversal to print the nodes in the correct order.
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Q3. Can a unique key be a primary key?
Ans. 
Yes, a unique key can also be a primary key.
• A primary key must be unique, but a unique key does not necessarily have to be the primary key.

• A table can have multiple unique keys, but only one primary key.

• Example: In a table of employees, the employee ID can be a unique key and also the primary key.
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Q4. Is it better to use a normalized form for database design, or is it more efficient to store data in a single table or two tables?
Ans. 
Normalized form is better for database design for data integrity and flexibility.
• Normalized form reduces data redundancy and improves data integrity.

• Normalized form allows for easier data updates and maintenance.

• Denormalized form may be more efficient for read-heavy applications with complex queries.

• Consider denormalization for performance optimization after thorough analysis.

• Example: Normalized form for a customer and...read more
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Round duration - 60 minutes
Round difficulty - Medium

The interviewer had good work experience. She was polite and calm. After brief introduction she straight jumped into my current projects and she covered my entire CV.

Round duration - 45 minutes
Round difficulty - Easy

This was a technical round involving questions on OOPS concepts and puzzles.

Q1. What is the total number of squares on a chessboard?
Ans. 
There are 204 squares on a chessboard.
• The chessboard has 64 squares in total.

• Each square can be divided into smaller squares, such as 1x1, 2x2, 3x3, etc.

• The total number of squares can be calculated by adding the squares of all sizes together.
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Q2. What is C++?
Ans. 
C++ is a high-level programming language known for its efficiency, flexibility, and performance.
• C++ is an object-oriented language with features like classes, inheritance, and polymorphism.

• It allows low-level memory manipulation through pointers.

• C++ is used in developing system software, game engines, and high-performance applications.
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Q3. What is the difference between deep copy and shallow copy?
Ans. 
Deep copy creates a new copy of an object with all nested objects also copied, while shallow copy creates a new copy of an object with references to nested objects.
• Deep copy creates a new object and recursively copies all nested objects, resulting in a completely independent copy.

• Shallow copy creates a new object but only copies references to nested objects, so changes in nested objects will reflect in both the origina...read more
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Q4. What are template classes? Can you write a program for the assignment operator '=' for a template class such that it behaves differently for 'int' and 'char *'?
Ans. 
Template classes are classes that can work with any data type. Assignment operator can be overloaded to behave differently for different data types.
• Template classes allow for writing generic classes that can work with any data type.

• Overloading the assignment operator allows for custom behavior based on the data type.

• Example: template <class T> class MyClass { T data; public: MyClass& operator=(const T& ot...read more
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Round duration - 30 minutes
Round difficulty - Easy

This was a 30 minute HR round. The interviewer asked me a number of questions to know more about me.

Be good on basics of coding

Q1. Some sql queries and code piece related to substring
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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
Ans. 
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. All about react
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Round 1 was of aptitude test with two sections overall it was easy but very less time.

Q1. Core java and advance java , project what u have done and puzzles
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