D2K Technologies India Senior Developer Interview Questions and Answers

Aptitude test

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Q1. Puzzle , sql related questions
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Q1. React js, ReactHooks, es67 features, bootstrap
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60mintues DSA level coding exam

2 Programming questions

Q1. String Pool OOPS Internal Working on Hashmap
Ans. 
String pool is a memory area in Java where strings are stored to optimize memory usage. OOPS stands for Object-Oriented Programming System. HashMap is a data structure in Java that stores key-value pairs.
• String pool in Java is a special memory area where strings are stored to optimize memory usage.

• OOPS stands for Object-Oriented Programming System, a programming paradigm based on the concept of objects.

• HashMap is a dat...read more
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Aptitude tests will test your ability to perform tasks and react to situations at work.

Coding tests are programming assessment tools used to objectively evaluate a candidate's programming skills across parameters such as problem-solving, coding aptitude, and de-bugging.

Q1. Coding tests are programming assessment tools used to objectively evaluate a candidate's programming skills across parameters such as problem-solving, coding aptitude, and de-bugging.
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Q2. Tell me about yourself. ... Why do you want to work for our company? ... What are your greatest strengths and weaknesses? ... Why are you looking for a change? ... Tell me about the gap in your resume. ...
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All the questions are very easy and basic

Q1. What opration system you are using. What are the latest version of windows. What are zip and unzip file. Primary key is null . Primary key is zero. What is JVM. What is LAN and WAN.
Ans. 
The questions cover topics like operating systems, file compression, primary keys, JVM, and network types.
• The latest versions of Windows are Windows 10 and Windows Server 2019.

• ZIP is a file compression format used to reduce file size and bundle multiple files together.

• Unzip is the process of extracting files from a ZIP archive.

• A primary key is a unique identifier for a database record. It cannot be null.

• A primary key c...read more
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Q2. Features of java and why pointer is not supported in java
Ans. 
Java is a popular programming language known for its platform independence and object-oriented features. It does not support pointers to ensure memory safety and prevent direct memory manipulation.
• Java uses references instead of pointers to access objects, which provides a level of abstraction and simplifies memory management.

• Pointers in languages like C and C++ can lead to memory leaks, segmentation faults, and other ...read more
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Number system coding decoding

Palidroms number Reverse arrays

Indian middle class

Q1. Tell me about your hobby and tell me about past birthday
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Q1. Definition of oops
Ans. 
Object-oriented programming paradigm that focuses on objects and classes for code organization and reusability.
• Encapsulation: bundling data and methods that operate on the data into a single unit (object)

• Inheritance: ability of a class to inherit properties and behavior from another class

• Polymorphism: ability to present the same interface for different data types
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