Nile Technologies Software Developer Interview Questions and Answers for Experienced

Q1. In trend java questions
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Q1. Advance java questions, questions related to microservice and java 8
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Q1. Basic JS questions
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Q2. String Concat through function
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Advanced JS, PHP related questions

Q1. What is jdk, string related questions, basic java oops questions?
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Q1. What is Virtual DOM, Explain ?
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Virtual DOM is a concept in web development where a lightweight copy of the actual DOM is created and manipulated for efficient rendering.
• Virtual DOM is an abstraction of the real DOM.

• It is used in frameworks like React to improve performance.

• Changes made to the virtual DOM are compared with the actual DOM, and only the necessary updates are applied.

• This approach reduces the number of direct manipulations on the actual...read more
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Q2. What is Higher Order Component ?
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Higher Order Component is a function that takes a component and returns a new component with additional functionality.
• Higher Order Components (HOCs) are a pattern in React for reusing component logic.

• They are functions that accept a component and return a new component with enhanced capabilities.

• HOCs can be used for cross-cutting concerns like authentication, logging, or data fetching.

• They enable code reuse, compositio...read more
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Q3. Life Cycle Methods in React
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Life Cycle Methods in React
• React components have several life cycle methods that are called at different stages of a component's life

• These methods allow developers to perform actions like initializing state, fetching data, and updating the UI

• Some commonly used life cycle methods are componentDidMount, componentDidUpdate, and componentWillUnmount
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Some maths related questions

Q1. Related to testing
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4 Coding Questions Were Given.
Check Palindrome String
Longest Increasing Subsequence
Group Anagrams
Add Two Numbers(Linked List)

Questions were picked from leetcode but the restriction of not using any inbuild function made them difficult to solve in the given time frame.

Q1. Basic Java Technical Questions
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Q2. Throws Vs Throw
Ans. 
Throws is used for checked exceptions in Java, while throw is used to explicitly throw an exception.
• Throws is used in method signature to declare that the method may throw a checked exception.

• Throw is used to actually throw an exception in the code.

• Example: public void method() throws IOException { //code }

• Example: throw new IOException();
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Q3. Method Overriding Basics and Output-Based Questions
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Q4. Springboot annotations
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Q5. Inheritance and Concept of Abstract Classes and Interfaces
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Inheritance allows a class to inherit properties and behaviors from another class. Abstract classes cannot be instantiated and can have abstract methods. Interfaces define a contract for classes to implement.
• Inheritance allows a class to inherit properties and behaviors from another class

• Abstract classes cannot be instantiated and can have abstract methods

• Interfaces define a contract for classes to implement
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Q1. Questions on current projects. How & why were the frameworks used
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Q2. Asked basic questions on OS, networking, database
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Q3. Gave take home assignment of DSA questions. One question was to design LRU cache. Don't remember the other one,
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Q1. Difference between concurrency and parallelism
Ans. 
Concurrency is about dealing with multiple tasks at the same time, while parallelism is about executing multiple tasks simultaneously.
• Concurrency is about managing multiple tasks and switching between them quickly.

• Parallelism is about actually executing multiple tasks at the same time.

• Concurrency can be achieved in a single-core processor through task switching.

• Parallelism requires multiple cores or processors to execu...read more
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Q2. How will you sort 1TB of array/data
Ans. 
Use external sorting techniques like merge sort or quick sort to efficiently sort large amounts of data.
• Divide the 1TB array into smaller chunks that can fit into memory

• Sort each chunk individually using a fast sorting algorithm like merge sort or quick sort

• Merge the sorted chunks back together to get the final sorted array

• Consider using parallel processing or distributed systems for faster sorting

• Example: Divide the 1...read more
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Had to brief about myself, my technical skills and projects. Few Technical questions regarding the tech stack and casual discussion.