Vaidik Eduservices Java Full Stack Developer Interview Questions and Answers

Q1. About Myself in details
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Q2. Past internships and work experiences
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Q1. Primary keys, Unique key
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Q2. Usage advantages and disadvantages of Indexing
Ans. 
Indexing improves data retrieval speed but can increase storage and maintenance costs.
• Faster query performance: Indexes allow for quicker data retrieval. For example, searching for a user by ID is faster with an index.

• Reduced I/O operations: Indexes minimize the number of disk reads required to find data, enhancing performance.

• Increased storage requirements: Indexes consume additional disk space, which can be significa...read more
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SQL- 1 departments with no users
2 dept_id and their respective no. of users

DSA1: Most frequent no. in an array
DSA2: Zero Sum subarray exists

Basic coding maths aptitude java python communication skills test

Java coding c plus python SQL oracle dbmsos

Data structures, particularly strings, play a crucial role in problem-solving.

Q1. Please tell me about yourself.
Ans. First of all , thank you! For this opportunity to introduce my self. I am Akash kumar kushwaha, I was born in bihar 2001 , but I live in ghaziabad now. I m currently pursuing my b.tech from IMS engineering college ghaziabad. And I completed my 10th and 12th from co-operative uchh vidyalaya jagdishpur with score 60% in 10th and 65% in 12th . And my hobby is playing cricket and travelling.
Answered by AKASH KUMAR KUSHWAHA
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Q2. Why should we hire you?
Ans. 
I have a strong technical background, excellent problem-solving skills, and a passion for software development.
• I have a Bachelor's degree in Computer Science and 5 years of experience in software development.

• I am proficient in multiple programming languages such as Java, Python, and JavaScript.

• I have a track record of delivering high-quality code on time and within budget.

• I am a quick learner and always eager to stay u...read more
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Q3. What are your strength and weakness .
Ans. 
Strength: Problem-solving skills, Weakness: Impatience
• Strength: Strong problem-solving skills demonstrated through successful projects

• Weakness: Impatience when tasks take longer than expected, working on improving patience through time management techniques
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Q4. Why did you choose career in software developer.
Ans. 
Passion for problem-solving and creating innovative solutions drove me to pursue a career in software development.
• Fascination with technology and its potential to improve lives

• Enjoyment of logical thinking and coding challenges

• Desire to constantly learn and adapt in a fast-paced industry

• Previous experience in programming projects or internships
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Q1. What is your area of expertise in programming languages?
Ans. 
My area of expertise in programming languages is in web development, specifically with JavaScript, HTML, and CSS.
• Proficient in JavaScript for client-side scripting and server-side development with Node.js

• Experienced in building responsive and interactive web applications using HTML and CSS

• Familiar with popular frameworks and libraries like React, Angular, and Bootstrap
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Q2. What is JavaScript, and what are its benefits?
Ans. 
JavaScript is a high-level, interpreted programming language used for creating interactive websites.
• JavaScript is commonly used for client-side web development.

• It allows for dynamic content updates without reloading the page.

• JavaScript can be used to create interactive elements like forms, animations, and games.

• It is supported by all major web browsers.

• JavaScript can also be used for server-side development with Node.j...read more
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Q1. Find duplicates in an array
Ans. 
Use a hash set to find duplicates in an array of strings.
• Create a hash set to store unique elements.

• Iterate through the array and check if the element is already in the hash set.

• If it is, then it is a duplicate. If not, add it to the hash set.
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Q2. Find single duplicate element in an array where contents of the array are length of array - 1
Ans. 
Find the single duplicate element in an array of strings with length n-1.
• Iterate through the array and use a HashSet to keep track of elements seen so far.

• If an element is already in the HashSet, that is the duplicate element.

• Return the duplicate element once found.
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Create a student support system

Q1. Design an order and payments system for an EdTech company
Ans. 
Design an order and payments system for an EdTech company
• Allow users to browse and select courses

• Implement a shopping cart for users to add courses

• Integrate payment gateways for secure transactions

• Provide order confirmation and receipt to users

• Allow users to track their order status
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Q1. About Lighnting Web componet
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Basic coding and MySQL queries. Like Types of join, having and where difference etc.

Q1. Salary Discussion.
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Q1. What is OOPS concepts.
Ans. 
OOPS concepts refer to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

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

• Abstraction: Hiding the complex implementation detail...read more
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Q2. What is PDO and uses in PHP.
Ans. 
PDO stands for PHP Data Objects, a database access layer providing a uniform method of access to multiple databases.
• PDO is a PHP extension that provides a data-access abstraction layer.

• It supports multiple database systems like MySQL, PostgreSQL, SQLite, etc.

• PDO helps prevent SQL injection attacks by using prepared statements.

• It allows for error handling and supports transactions.

• Example: $pdo = new PDO('mysql:host=loc...read more
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Q1. What is latest technology you have worked on
Ans. 
I have worked on React Native for mobile app development.
• Developed a mobile app for a client using React Native

• Used Redux for state management

• Integrated with Firebase for real-time database and authentication

• Implemented push notifications using Firebase Cloud Messaging
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Q1. Why you want to join us
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