Unthinkable Solutions Software Development Engineer Intern Interview Questions and Answers

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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Leetcode Medium Type Questions

Q1. Design a Online System to book Salon Professionals like Urban Company.
Ans. 
Design an online system to book salon professionals like Urban Company.
• User registration and login system

• Search functionality to find salon professionals based on location, services offered, ratings, etc.

• Booking system with calendar availability and payment integration

• Review and rating system for users to provide feedback on salon professionals

• Notification system for booking confirmations, reminders, and updates
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Q1. What is your name
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Q2. What is your strength
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Aptitude test was easy level and moderate level.

Coding test was held in the google form which was very easy.

Q1. What is volatile keyword?
Ans. 
The volatile keyword in software engineering is used to indicate that a variable's value can be modified by multiple threads.
• Volatile keyword ensures that the variable's value is always read from and written to the main memory, rather than cached in a thread's local cache.

• It is used to prevent unexpected behavior in multi-threaded environments where multiple threads may access and modify the same variable simultaneousl...read more
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Q2. What is abstract class
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An abstract class is a class that cannot be instantiated and is meant to be subclassed.
• An abstract class can have abstract methods that must be implemented by its subclasses.

• An abstract class can also have non-abstract methods that can be inherited by its subclasses.

• An abstract class provides a common interface for its subclasses.

• An abstract class can have instance variables and constructors.

• An abstract class cannot be...read more
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Q3. Where do you use abstract class
Ans. 
Abstract classes are used to provide a common interface and partial implementation for related classes.
• Abstract classes are used when you want to create a base class that cannot be instantiated on its own but can be inherited by other classes.

• They are useful when you want to define common methods and properties that multiple related classes should have.

• Abstract classes can have both abstract and non-abstract methods.

• Ab...read more
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DSA coding 2-3 question

Java, DSA coding, java 8 coding, multithreading

Java8, spring-boot, DSA coding

Q1. DSA coding, java 8 coding, spring boot, mysql
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Difficulty level is medium

Q1. Medium about java and database
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Q1. Medium level - about project
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It was basic test. online.

2 questions on arrays. online.

The general topic. Be point to point

Q1. SQL and Python questions. online. screen sharing
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