Tech Mahindra Senior Java Developer Interview Questions and Answers for Experienced

Q1. What is final and finally
Ans. 
final is a keyword in Java used to declare constants, while finally is a block used in exception handling to ensure code is executed regardless of an exception.
• final keyword is used to declare constants in Java

• final variables cannot be reassigned once initialized

• finally block is used in exception handling to ensure code is executed regardless of an exception

• finally block is often used to release resources like closing
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Q2. Brief description about the last project
Ans. 
Developed a web application for a financial institution to manage customer accounts and transactions.
• Used Java Spring framework for backend development

• Implemented RESTful APIs for communication between frontend and backend

• Utilized Hibernate for database interaction

• Integrated third-party payment gateway for transactions
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Medium level Strings and Array questions

Q1. Find LCA of a node in BST
Ans. 
LCA of a node in BST is the lowest common ancestor of two nodes in a binary search tree.
• Traverse the BST from the root node to find the LCA of the given nodes.

• Compare the values of the nodes with the current node to determine the LCA.

• If one node is on the left subtree and the other is on the right subtree, the current node is the LCA.
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Q2. Optimise the above solution
Ans. 
Optimize the solution by using efficient data structures and algorithms.
• Use HashMap instead of ArrayList for faster lookup

• Implement caching to store previously calculated results

• Consider using multithreading for parallel processing
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