Brane Enterprises Software Developer 1 Interview Questions and Answers

The first round was a group discussion about online shopping.

Q1. What questions did the interviewer ask is related to the Java programming language
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Q1. Discussed about General questions related to Company and personal details
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Q1. JavaScript , coding questions
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Q1. Coding problem, JavaScript and nodejs question
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Q1. Find longest palindromic substring in a given string.
Ans. 
Use dynamic programming to find the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes.

• Store the length of the longest palindrome found so far.

• Return the substring based on the start and end indices of the longest palindrome.
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Q2. How to serialize and deserialise a tree
Ans. 
To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
• Use pre-order traversal to serialize the tree by storing the node values in a list or string.

• For deserialization, reconstruct the tree by recursively building nodes from the serialized data.

• Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
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Q3. Find if a given regex (containing ., * and lower case english chars) matches a given string.
Ans. 
Use regex library to match given regex with string.
• Use a regex library like re in Python to match the given regex with the string.

• Check if the regex matches the string using the library functions.

• Handle cases where the regex contains special characters like . and * appropriately.
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Q4. Explain about throttling and implement throttle function.
Ans. 
Throttling is a technique used to control the rate of requests sent to a server.
• Throttling helps prevent server overload by limiting the number of requests processed at a time.

• Implementing a throttle function involves setting a maximum request rate and delaying excess requests.

• Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.

• Example: Throttlin...read more
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Q1. Find squares of elements in a sorted array and return the sorted response.
Ans. 
Sort the squares of elements in a sorted array and return the sorted response.
• Iterate through the array and square each element.

• Store the squared values in a new array.

• Sort the new array and return it.
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Q2. Write a short promise example and implement your own promise
Ans. 
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
• Promises are used to handle asynchronous operations in JavaScript.

• They represent a value that may be available now, in the future, or never.

• Promises have three states: pending, fulfilled, or rejected.

• Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
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Q3. Explain event loop, what are different types of queues in event loop
Ans. 
Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
• Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.

• Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
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Q4. What is virtual DOM and why its faster
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
• Virtual DOM is a concept used in frameworks like React to optimize rendering performance.

• Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.

• This approach reduces the number of actual DOM manipulations, resulting in faster...read more
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Q1. What basic JavaScript and React concepts were you asked about during the interview?
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Q2. Closures, useMemo, useCalbback and a practical task is given that should completed within 20 minutes
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First round will be coding test which will have Core java questions

Q1. Type of Class Loaders available in java
Ans. 
Java has three types of class loaders: Bootstrap Class Loader, Extension Class Loader, and System Class Loader.
• Bootstrap Class Loader loads core Java classes located in the bootstrap classpath.

• Extension Class Loader loads classes from the extensions directory.

• System Class Loader loads classes from the classpath specified by the CLASSPATH environment variable.
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Q2. Coding question related find 3nd highest number with single loop and minimum time complexity.
Ans. 
Use a single loop to find the 3rd highest number in an array with minimum time complexity.
• Iterate through the array and keep track of the three highest numbers encountered so far.

• Update the three highest numbers as you iterate through the array.

• Return the third highest number once the loop is completed.
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Q3. What is diff between cyclicBarrier and countDownLatch?
Ans. 
CyclicBarrier allows a group of threads to wait at a barrier until all threads have reached it, while CountDownLatch allows one or more threads to wait until a set of operations being performed in other threads completes.
• CyclicBarrier is reusable, while CountDownLatch is not.

• CyclicBarrier allows all threads to wait for each other, while CountDownLatch allows one thread to wait for others.

• CyclicBarrier resets automatica...read more
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Q4. What is diff between JPARepository and CURDRepository?
Ans. 
JPARepository is a Spring Data interface for JPA-based repositories, while CRUDRepository is a generic interface for CRUD operations.
• JPARepository extends CRUDRepository and provides additional JPA-specific methods.

• CRUDRepository is a generic interface for CRUD operations on a repository.

• JPARepository is typically used for JPA-based repositories, while CRUDRepository can be used for any type of repository.

• JPARepository...read more
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Q1. Second round is pending
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Q1. String based questions in java
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Q2. What are the fundamental concepts of Java?
Ans. 
Fundamental concepts of Java include OOP, platform independence, memory management, and exception handling.
• Object-oriented programming (OOP) - Java is based on classes and objects, allowing for encapsulation, inheritance, and polymorphism.

• Platform independence - Java code can run on any platform with the help of JVM (Java Virtual Machine).

• Memory management - Java has automatic garbage collection to manage memory effici...read more
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Java based questions and few DSA questions

About technical and aptitude skill

Q1. About yourself and payroll
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Q2. Technical skills and experience
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Q1. About types of testing
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Q2. Use any tool for automation
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Q1. What is the importance of manual testing when compared to automation testing
Ans. 
Manual testing is important for exploratory testing, usability testing, and ad-hoc testing.
• Manual testing allows for exploratory testing where testers can explore the application and identify unexpected issues.

• Usability testing, which involves real users interacting with the software, is best done manually to capture user experience.

• Ad-hoc testing, where testers randomly test the application without predefined test cas...read more
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Q2. Real life scenario on web application testing
Ans. 
Testing a web application for an online shopping platform
• Testing the functionality of adding items to the cart and checking out

• Testing the payment gateway integration for secure transactions

• Testing the search functionality to ensure accurate results are displayed

• Testing the responsiveness of the website on different devices and browsers
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