Infosys interview questions

Practice 18+ real Infosys interview questions covering coding, technical, project, and HR rounds. Prepare smarter for Infosys placement interviews.

Preview Questions

  1. Why do you want to join Infosys?

    I want to join Infosys because I admire its position as a global technology leader and its strong commitment to innovation and continuous learning. Infosys’s emphasis on professional development and diverse project...

  2. Explain Object-Oriented Programming (OOP) principles with examples

    Object-Oriented Programming is a programming paradigm that structures code as objects and classes to model real-world entities. There are four core principles of OOP, each crucial for writing scalable and maintainable...

  3. What is the difference between an array and a linked list?

    Arrays and linked lists are both linear data structures, but they differ significantly in implementation, performance, and use cases. Arrays store elements in contiguous memory locations. This provides O(1) random...

  4. How does database indexing improve query performance?

    Database indexing is a critical optimization technique that dramatically improves query performance. Without indexes, the database must perform a full table scan, reading every row sequentially to find matching records....

  5. Write a program to check if a string is a palindrome. Different Approaches

    Method 1: Two-pointer approach (most efficient) public static boolean isPalindromeIterative(String str) { // Remove non-alphanumeric characters and convert to lowercase str = str.replaceAll("[^a-zA-Z0-9]",...

  6. Explain the difference between SQL and NoSQL databases

    SQL (Structured Query Language) and NoSQL databases serve different purposes and are suited for different scenarios. SQL Databases use structured schemas with predefined tables, rows, and columns. They follow ACID...