6D Technologies Interview Questions and Answers

Q1. Difference between hashmap and hashset
Ans. 
HashMap is a key-value pair collection while HashSet is a collection of unique elements.
• HashMap stores key-value pairs while HashSet stores unique elements

• HashMap allows duplicate values but keys must be unique, HashSet does not allow duplicates

• HashMap uses keys to retrieve values, HashSet does not have keys
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Q2. Tell me about yourself
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java, Spring Boot, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring Boot, and Angular

• Strong problem-solving skills

• Experience working in Agile development environment

• Passionate about learning new technologies
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Q3. Write a program to find a duplicate in two list (Take two list and wirte a program to print the same elementsin both list in note pad)
Ans. 
Program to find duplicates in two lists and print them in notepad
• Iterate through each element in the first list and check if it exists in the second list

• If a duplicate is found, print it to a notepad file

• Use a hash set to store elements from the first list for efficient lookup
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Q1. What is lookup annotation in springboot
Ans. 
Lookup annotation in Spring Boot is used to indicate that a method should be cached for faster retrieval.
• Lookup annotation is used in conjunction with @Cacheable annotation to cache the result of a method.

• It is commonly used in Spring Boot applications to improve performance by caching frequently accessed data.

• Example: @Lookup @Cacheable("books") public List findAllBooks() { return bookRepository.findAll(); }
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Q2. What is memory management in java
Ans. 
Memory management in Java refers to the process of allocating and deallocating memory for objects in the Java Virtual Machine (JVM).
• Java uses automatic memory management through garbage collection to handle memory allocation and deallocation.

• Memory in Java is divided into two main areas: stack memory and heap memory.

• Stack memory is used for storing primitive data types and references to objects, while heap memory is us...read more
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Q3. What is thread pool and what are its functions
Ans. 
A thread pool is a collection of worker threads that efficiently execute asynchronous tasks.
• Thread pool helps in managing and reusing a pool of threads to execute tasks concurrently.

• It improves performance by reducing the overhead of creating new threads for each task.

• Thread pool can limit the number of concurrent threads to prevent resource exhaustion.

• Examples include Java's Executor framework and .NET's ThreadPool cl...read more
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Q4. Write a program to implement a stack using array
Ans. 
Implement a stack using array in a program
• Create an array to store the stack elements

• Implement push and pop functions to add and remove elements from the stack

• Keep track of the top of the stack using a variable
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Q1. Tell me about your self
Ans. 
I am a passionate software engineer with experience in developing web applications and a strong background in computer science.
• Experienced in developing web applications using technologies such as HTML, CSS, JavaScript, and React

• Strong background in computer science with knowledge of algorithms and data structures

• Proficient in programming languages such as Java, Python, and C++

• Excellent problem-solving skills and abili...read more
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Q2. Some general questions
Ans. 
General questions in a software engineering interview assess technical skills, problem-solving, and cultural fit.
• Understand data structures: e.g., arrays, linked lists, trees.

• Be prepared to discuss algorithms: e.g., sorting, searching.

• Showcase your coding skills: e.g., solve a coding challenge.

• Discuss past projects: e.g., technologies used, challenges faced.

• Demonstrate soft skills: e.g., teamwork, communication.
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Mostsly asked questions related to linux, os and mysql

You need to keep on talking, thats all you need to do.

Q1. Asked some basic Linux commands
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Q2. Asked keys in RDBMs like primary key, candidate keys, alternate keys etc.
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Q1. Asked questions related to data structures.
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Q2. Asked questions related to mysql.
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Q1. What challenges I have faced and how did I overcome, when I volunteered for an event in college.
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Q2. I am willing to relocate to bangalore.
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Q1. Automation and manual testing
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Q2. Linux and unix , swl queries
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