Unify Technologies Java Full Stack Developer Interview Questions and Answers

What is OOPS concepts?

Design and implement a least recently used (LRU) cache mechanism that supports `get` and `put` operations.

Q1. Tell me about yourself
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Q2. Explain your project
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Q3. What's your strongest programming language
Ans. 
My strongest programming language is Java.
• Extensive experience with Java programming

• Proficient in object-oriented programming

• Familiar with Java frameworks like Spring and Hibernate
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Aptitude, reasoning, verbal plus 2 programming questions which you have to solve in Java

Q1. Mention and explain 2 OOPS concepts
Ans. 
Encapsulation and Inheritance are two important OOPS concepts.
• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class with private data members and public methods.

• Inheritance: Ability of a class to inherit properties and behavior from another class. Example: Subclass inheriting from a superclass.
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Q2. Difference between Stack and Array
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Stack is a data structure that follows Last In First Out (LIFO) principle, while an array is a data structure that stores elements in contiguous memory locations.
• Stack is dynamic in size, while array has a fixed size.

• Stack operations include push and pop, while array operations include random access.

• Example: Stack can be implemented using arrays, but arrays cannot be implemented using stacks.
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Q3. Write a program to check if an arraylist contains a duplicate element
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Program to check for duplicate elements in an arraylist of strings
• Iterate through the arraylist and use a HashSet to store unique elements

• If an element is already in the HashSet, it is a duplicate

• Return true if a duplicate is found, false otherwise
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Q1. Talk about yourself for 2 minutes without mentioning things like CGPA, marks, etc.
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Q2. Indepth questions about project
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Q1. Asked about technologies and coding
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Q2. Components in reactjs
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Reactjs components are reusable, independent pieces of UI that can be composed together to build complex user interfaces.
• Components are the building blocks of a React application

• They can be class components or functional components

• Components can have their own state and lifecycle methods

• Components can be nested within other components to create a hierarchy

• Examples: Button component, Navbar component, UserList component
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Q3. Given url to fetch data from api
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Use the url to make a request to the API and fetch data.
• Use a library like axios or fetch to make the HTTP request.

• Parse the response data to extract the necessary information.

• Handle any errors that may occur during the request.
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Q4. Cloud related scenerio questions
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Q1. What is your current salary
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I am unable to provide my current salary.
• I am unable to disclose my current salary due to confidentiality agreements.

• My current salary is subject to a non-disclosure agreement.

• I prefer not to discuss my current salary during the interview process.
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Q2. What is your experience
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I have 5 years of experience as a Software Developer.
• Developed web applications using HTML, CSS, and JavaScript.

• Worked with various programming languages such as Java, C++, and Python.

• Experience in database management with SQL and NoSQL.

• Familiar with Agile development methodologies.

• Collaborated with cross-functional teams to deliver high-quality software solutions.
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Contains linear and non linear data structures deep knowledge of trees and graphs

Q1. Able to do dry run on page
Ans. 
Dry run on a page involves testing the code without actually executing it.
• Dry run involves walking through the code manually to check for errors

• Helps in identifying logic errors before actual execution

• Commonly used in debugging and testing code
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Q1. A hashmap DSA question
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Q2. Difference between javascript and react
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Write a function that prints the numbers from 1 to 100. However, for multiples of three, print "Fizz" instead of the number, and for multiples of five, print "Buzz." For numbers that are multiples of both three and five, print "FizzBuzz."

Group discussion with fellow students on topics related to IT companies.