6D Technologies Software Engineer Interview Questions, Process, and Tips

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
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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
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Q2. Some general questions
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Q1. Create a form in react without any libaraies
Ans. 
Creating a form in React without any libraries
• Use state to manage form data

• Use onChange event to update state as user types

• Use onSubmit event to handle form submission
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Q1. Merge two linked list..
Ans. 
Merging two linked lists involves combining the elements of both lists into a single sorted list.
• Create a new linked list to store the merged list

• Compare the values of the nodes from both lists and add the smaller value to the merged list

• Move the pointer of the list with the smaller value to the next node

• Repeat the comparison and addition until both lists are exhausted

• If one list is exhausted, append the remaining node
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Q2. Program for selection sort
Ans. 
Selection sort is a simple sorting algorithm that repeatedly selects the minimum element from an unsorted portion of the array and swaps it with the first element.
• Iterate through the array and find the minimum element

• Swap the minimum element with the first element

• Repeat the process for the remaining unsorted portion of the array
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Q3. What is critical section
Ans. 
A critical section is a part of a program where shared resources are accessed and must be protected from concurrent access.
• Critical sections are used to prevent race conditions and ensure data integrity.

• They are typically protected using locks or other synchronization mechanisms.

• Only one thread can execute the critical section at a time.

• Examples include accessing a shared database, updating a global variable, or modify
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Q1. Questions about project in depth
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Q1. Where do you see yourself in 5 years
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Questions from C, Java, linux, C++, Sql were asked

Q1. Problem solving using different programming languages.
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Online aptitude test was there it was easy basics of logic and maths were asked

Group discussion was a bit hard the topic was advantages and disadvantages of ai in decision making

Q1. Who program to print from 100 to 1
Ans. 
Program to print numbers from 100 to 1
• Use a loop to iterate from 100 to 1

• Print the current number in each iteration
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Q2. Explain java oops concept
Ans. 
Java OOPs concept is a programming paradigm that focuses on objects and their interactions.
• OOPs stands for Object-Oriented Programming System

• It is based on the concepts of classes and objects

• Encapsulation, Inheritance, Polymorphism, and Abstraction are the four main pillars of OOPs

• Java supports all the OOPs concepts

• Example: A class 'Car' can have properties like 'color', 'model', and 'year' and methods like 'start', 's
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Q1. Related the Language which you mentioned in Resume
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Q2. Technical questions related to Domain
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Q1. Coding related Questions
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Q1. Question related to resource
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