Bahwan CyberTek Full Stack Software Developer Interview Questions and Answers

1 Hours aptitude test on hacker rank based on Aptitude question, Java, SQL

Q1. Java interview questions.
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Q2. What is wrapper class?
Ans. 
Wrapper class is a class that wraps around a primitive data type and provides additional functionality.
• Wrapper classes in Java are used to convert primitive data types into objects.

• They provide methods to access the value of the wrapped primitive type.

• Examples include Integer, Double, Boolean, etc.
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Q1. Salary discussion and all.
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Q1. Difference between authentication and authorization
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Authentication verifies the identity of a user, while authorization determines what a user can access.
• Authentication confirms the user's identity through credentials like passwords or biometrics

• Authorization controls the user's access to resources or features based on their identity and permissions

• Example: Logging into a website with a username and password is authentication, while being able to view/edit specific page
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Q2. What is promises
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Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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Q3. What is rxjs and its uses
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RxJS is a library for reactive programming using Observables to handle asynchronous data streams.
• RxJS stands for Reactive Extensions for JavaScript.

• It allows you to work with asynchronous data streams and handle events.

• RxJS provides operators to transform, filter, combine, and create observables.

• Example: Using RxJS to handle user input events in a web application.
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Q1. About HTML, CSS, JS, Python ?
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Q2. What is Self Keyword in python?
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The self keyword in Python is a reference to the current instance of a class.
• Self is the first parameter in the definition of instance methods within a class.

• It is used to access variables and methods within the class.

• Self is not a reserved keyword in Python, but it is a convention to use self as the first parameter in instance methods.
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Q1. They Not Schedule Client Interview
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Aptitude
Logically reasoning
Verbal

Q1. Tell me about yourself 1 coding questions on arrays Few questions on DSA Few questions on DBMS About my project
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Q2. To remove the duplicate elements fromthe array
Ans. 
Use Set data structure to remove duplicate elements from the array.
• Create a Set from the array to automatically remove duplicates.

• Convert the Set back to an array to get the unique elements.

• Example: const array = ['apple', 'banana', 'apple', 'orange'];

• Example: const uniqueArray = [...new Set(array)];
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Q1. Difficulty faced while working on projects About the project
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Round duration - 30 minutes
Round difficulty - Medium

Basic questions from Operating System, Object Oriented Programming, DBMS, various tech stacks used in project. Be through with the basics of these subjects. Like in my case DDL and scheduling algorithms were asked.
Asked questions related on css,javascript and some sql queries. Interviewer was helpful. If one gives a answer that is not exactly correct, he provided me hints .

Q1. Can you explain the various CPU scheduling algorithms?
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Q2. 
Remove Character from String Problem Statement
Given a string str and a character 'X', develop a function to eliminate all instances of 'X' from str and return the resulting string.
Input:
The first lin...read more
Ans. Iterative Solution
• We create an empty string that will store our final result. We will return it at the end.
• We iterate from 0 to the length of the string. Say, our loop variable is i. We can then access the ith character as input[i]
• If the ith character equals the character c i.e input[i] == c, then we skip this character and do nothing.
• Else we need to append the character to the output string.
• We finally return the outpu...read more
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Topics consist of profit-loss, probability, permutation combination etc.

Coding question related to topics array and strings.

Q1. Questions related to Java, oops, DBMS and tech-stack are mention in the resume
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Q2. Role of java in backend, explain polymorphism in oops, reverse string.
Ans. 
Java is a popular backend language, polymorphism allows objects to be treated as instances of their parent class, reverse string by iterating through characters.
• Java is commonly used in backend development for its robustness and scalability.

• Polymorphism in OOP allows objects to be treated as instances of their parent class, enabling flexibility and reusability.

• To reverse a string, iterate through the characters from th...read more
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Q1. It also consists of technical questions, future goals, project discussion mentioned in the resume and related tech stack, future goals, etc.
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