Unthinkable Solutions Software Development Engineer Intern Interview Questions and Answers

One question relates to Linked list and another related to string

Q1. Circular linked list algorithm
Ans. 
Circular linked list is a data structure where the last node points back to the first node.
• In a circular linked list, each node has a pointer to the next node and the last node points back to the first node.

• Traversal in a circular linked list can start from any node and continue until the starting node is reached again.

• Insertion and deletion operations in a circular linked list are similar to those in a regular linked ...read more
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Q2. String manipulation and logical questioning
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Q3. String creation and deletion
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Q4. DSA problem solving questions
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Q5. Logical questions asked and informed
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Print a specific pattern using any programming language.

Q1. What is a class in Object-Oriented Programming (OOP)?
Ans. 
A class in OOP is a blueprint for creating objects, defining their properties and behaviors.
• Classes are templates for creating objects in OOP

• They define the properties (attributes) and behaviors (methods) of objects

• Objects are instances of classes, each with its own unique data

• Inheritance allows classes to inherit properties and behaviors from other classes

• Encapsulation ensures that the data is hidden and can only be a...read more
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Q2. What is the difference between an abstract class and an interface?
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Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics of subclasses, while interfaces are used to define contracts for...read more
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Q3. What is joining and creating an inner join query?
Ans. 
Joining is combining data from two or more tables based on a related column, while an inner join query retrieves only the matching records.
• Joining is used to combine data from multiple tables in a database.

• Inner join query retrieves only the records that have matching values in both tables.

• Syntax for inner join: SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;

• Example: SELECT orders.order_i...read more
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Q1. Starts with a introduction, Core Java concepts, OOPS concepts, Singleton design pattern, Spring boot annotations like service, restcontroller.
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Q2. DSA logical questions like 2nd highest number. How to find missing number from an array.
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Q1. 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

• Bachelor's degree in Computer Science from XYZ University
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Q2. Tell me about your family.
Ans. 
I come from a close-knit family of five, including my parents, older sister, and younger brother.
• Close-knit family of five

• Parents, older sister, and younger brother

• We enjoy spending time together traveling and trying new restaurants
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Q3. Why do you want to change the company
Ans. 
Seeking new challenges and opportunities for growth in a different environment.
• Desire for new challenges and learning opportunities

• Seeking a better work-life balance

• Interested in working with new technologies or industries

• Looking for a more collaborative team environment
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Q4. After that interviewer describes my work and position in the company.
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First round was GD1 - We were given a Topic of Democracy in India and have 5 mins to think on it..

Second round was GD2 - here, the Topic was "if you could have a superpower for one day what superpower you will choose" and we have to talk on this topic for 5 mins

Q1. Four pillars of OOPS with real world examples
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Q2. Solve Rotate Array Problem
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Q3. 8-10 questions asked on my Programming language (C++)
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Q1. Question asked on Final year project - what's your Contribution in the project
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Q2. Explain your Final year project
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Q3. Some logical question and puzzles
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Q4. There was alphanumeric characters and we have to output only the number from that string Input - "wih562idjedk42ndej56" Output - 5624256
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Q1. As a team Leader, how you manage all your team members when there is a conflict or disagreement arise in the project
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Q2. Some , Behavioural questions
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Buygtrvc sndgbhulitcyuvltyuxruyf jylbiuxtgrfdhmvjbjkkjtydtrsxgf

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Q1. What is your long term goal
Ans. 
To become a lead software architect and contribute to cutting-edge technology advancements.
• Advance to a lead software architect role

• Contribute to cutting-edge technology advancements

• Continuously improve skills and knowledge through learning and certifications
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Q2. Tell me about yourself
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I am a software developer with 5 years of experience in developing web applications using various technologies.
• Experienced in front-end development using HTML, CSS, and JavaScript

• Proficient in back-end development with languages like Java and Python

• Familiar with database management systems such as MySQL and MongoDB

• Strong problem-solving skills and ability to work in a team environment
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Leet code medium level question

Q1. About Java Streams
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Q2. Restful API coding completion based on given file
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Q1. To check your attitude
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Q2. Given detailed about company and what project you are going to work on?
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Q1. Hashmap working
Ans. 
Hashmap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hashmap uses a hashing function to map keys to indices in an array.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

• Example: HashMap<String, Integer> map = new HashMap<>(); map.put("key", 123); int value = map.get("key");
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Q2. Multithreading cases
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Q3. Scenario specific on how to handle multiple events on a single variable to have accurate result
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Q4. Database indexing
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Q5. Architecture level
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Q1. Springboot notations
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Q2. How to handle multiple request on springboot
Ans. 
Use thread pooling and asynchronous processing to handle multiple requests efficiently in Spring Boot.
• Implement thread pooling to manage multiple requests concurrently.

• Use asynchronous processing to handle requests without blocking the main thread.

• Consider using reactive programming with Spring WebFlux for better scalability.

• Optimize database queries and external API calls to reduce response times.

• Implement caching mec...read more
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