Blue Yonder Node JS 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. Core java basics
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Q2. Collections framework
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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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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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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. Min stack write code with full operation
Ans. 
A min stack is a stack data structure that supports the usual push and pop operations, along with an additional operation to retrieve the minimum element in constant time.
• Create a stack to store the elements and another stack to store the minimum values encountered so far.

• When pushing an element, check if it is smaller than the current minimum. If so, push it onto the minimum stack.

• When popping an element, check if it ...read more
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Q2. Graph and sql ,concept problem
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Q1. Merge Sort based tricky ques
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Q2. Island problem leetcode
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Asked about introduction and then few coding questions

Q1. Given a code, what will be the output of this?
Ans. 
The output of the code will be the sum of the elements in the given array.
• The code likely involves iterating through the array and adding up the elements.

• Make sure to handle edge cases like empty arrays or arrays with negative numbers.

• Example: If the array is [1, 2, 3], the output will be 6.
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Q2. What is a hashMap and difference between HashMap and concurrentHashMap
Ans. 
HashMap is a data structure in Java that stores key-value pairs. ConcurrentHashMap is a thread-safe version of HashMap.
• HashMap is not thread-safe, while ConcurrentHashMap is thread-safe.

• ConcurrentHashMap allows concurrent read and write operations without the need for external synchronization.

• HashMap allows null keys and values, while ConcurrentHashMap does not allow null keys or values.
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