Revature Associate Software Engineer Interview Questions, Process, and Tips for Freshers

Easy applitute question with 1 coding question at the end

Q1. String builder vs string buffer
Ans. 
String builder is faster but not thread-safe, while string buffer is slower but thread-safe.
• String builder is recommended for single-threaded applications for better performance.

• String buffer is recommended for multi-threaded applications to ensure thread safety.

• Example: StringBuilder sb = new StringBuilder(); StringBuffer sbf = new StringBuffer();
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Q2. Final keyword in oops
Ans. 
The final keyword in OOP is used to restrict the user from changing the value of a variable, overriding a method, or inheriting from a class.
• Final variable: value cannot be changed once assigned

• Final method: cannot be overridden in child classes

• Final class: cannot be inherited by other classes
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Q3. Bsf graph explanation
Ans. 
BSF graph explanation
• BFS (Breadth-First Search) is a graph traversal algorithm that explores all the neighbor nodes at the present depth before moving on to the nodes at the next depth.

• It uses a queue data structure to keep track of the nodes to visit next.

• BFS is often used to find the shortest path in an unweighted graph.

• Example: BFS can be used to find the shortest path in a maze from the starting point to the exit.
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Easy level questions

Q1. Difference between object and constructor?
Ans. 
Object is an instance of a class with its own state and behavior, while constructor is a special method used to initialize objects.
• Object is created from a class using the 'new' keyword.

• Constructor is a special method with the same name as the class.

• Object has its own state (attributes) and behavior (methods).

• Constructor is used to initialize the state of an object when it is created.

• Example: Class Car { constructor(ma...read more
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Q2. Difference between abstraction and encapsulation?
Ans. 
Abstraction focuses on hiding the implementation details while encapsulation focuses on bundling the data and methods that operate on the data into a single unit.
• Abstraction is the concept of hiding the complex implementation details and showing only the necessary features of an object.

• Encapsulation is the bundling of data and methods that operate on the data into a single unit.

• Abstraction allows for creating simple in...read more
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It contains 60 questions solve in 60 minutes and 1 coding questions simply debug extra 15 minutes are given

Q1. 7 to 8 minut google meet technical interview about your project, sql and basics of your main language
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Q1. It just normal interview
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There was an OA which comprised of Aptitude questions, as well as Technical questions. And, there was a single coding question(Basic level)

Q1. This round was with the CTO of the company and manager, and CHRO of the company. Questions related to project were asked.
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Q2. Tell me something that is not there in your resume. Describe any one of your project in detail What is S3 architecture? Difference between GET and POST Describe HTTP Response
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It was online assessment

Q1. Questions were mainly from oops c++ and database management
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Q2. What is four pillars of oops. What is array and vector. Implement queue using stack. Project based questions.
Ans. 
The four pillars of OOP are encapsulation, inheritance, polymorphism, and abstraction. Arrays are fixed-size data structures, while vectors are dynamic arrays. A queue can be implemented using two stacks.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Creating new classes based on existing classes, inheriting their attributes and methods.

• Polymorphism: Objects of differe...read more
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Q3. Four pillars of opps
Ans. 
The four pillars of object-oriented programming are encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allowing a new class to inherit properties and behavior from an existing class.

• Polymorphism: The ability for objects of different classes to respond to the same message.

• Abstraction: Hiding the complex implementatio...read more
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Q4. What is dbms explain
Ans. 
DBMS stands for Database Management System. It is a software system that allows users to define, create, maintain and control access to databases.
• DBMS is a software system that manages databases.

• It allows users to define, create, maintain, and control access to databases.

• DBMS provides tools for data manipulation, retrieval, and security.

• Examples of DBMS include MySQL, Oracle, SQL Server, and PostgreSQL.
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Q5. What isSQL.and some queries
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Aptitude test

Current affairs

Q1. Puzzle , sql related questions
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30 mins Aptitude Question

30 mins - 3 Coding Question

Q1. Describe Rest API
Ans. 
Rest API is a set of rules and conventions for building and interacting with web services using HTTP methods.
• Rest API stands for Representational State Transfer Application Programming Interface.

• It uses standard HTTP methods like GET, POST, PUT, DELETE to perform CRUD operations.

• RESTful APIs use URLs to access resources, and return data in JSON or XML format.

• Stateless communication allows for scalability and flexibilit...read more
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Q2. What is various Response code. Diffenrence b/w 200 & 201, 400 & 403
Ans. 
Response codes indicate the status of a HTTP request. 200 & 201 are success codes, while 400 & 403 are client error codes.
• 200 - OK: Request was successful

• 201 - Created: Request was successful and a new resource was created

• 400 - Bad Request: The server cannot process the request due to a client error

• 403 - Forbidden: The server understood the request, but refuses to authorize it
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Q1. What do u mean by data
Ans. 
Data refers to facts, statistics, or information collected for analysis or reference.
• Data is raw, unprocessed information.

• It can be in the form of numbers, text, images, or any other format.

• Examples include customer names, product prices, and sales figures.

• Data can be structured (organized in a specific way) or unstructured (not organized).
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Q2. What is preprocessed data
Ans. 
Preprocessed data is data that has been cleaned, transformed, and organized for analysis or modeling.
• Preprocessed data is often used in machine learning and data analysis to improve the accuracy and efficiency of models.

• Common preprocessing steps include removing missing values, scaling features, and encoding categorical variables.

• Examples of preprocessing techniques include normalization, standardization, one-hot enco
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Q3. What do u mean by info
Ans. 
Info refers to data or knowledge that provides details or context about a specific topic or subject.
• Info can be in the form of facts, statistics, or explanations.

• It helps to understand a topic better or make informed decisions.

• Examples of info include news articles, research papers, and educational resources.
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Q4. How to copy from 2 tables and paste in 3rd one in sql
Ans. 
Use SQL INSERT INTO SELECT statement to copy data from 2 tables and paste into a 3rd table.
• Use INSERT INTO SELECT statement to copy data from 2 tables and paste into a 3rd table.

• Specify the columns you want to copy from each table in the SELECT statement.

• Make sure the columns in the SELECT statement match the columns in the 3rd table where you are pasting the data.
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Q5. Reverse string using any language you know
Ans. 
Reverse a string using any programming language
• Use built-in functions like reverse() or slice() in languages like Python or JavaScript

• Iterate through the string in reverse order and append each character to a new string

• Use a stack data structure to push each character onto the stack and then pop them off to reverse the string
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Q6. A puzzle question was asked but i don't remeber it.
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