Infosys Senior Software Engineer Interview Questions and Answers

An anagram is a word formed by rearranging the letters of another, while non-repeating characters are unique in a string.

• Anagram Check: To determine if two strings are anagrams, sort both strings and compare them. Example: 'listen' and 'silent'.

• Character Count: Use a hash map to count occurrences of each character in a string to find the first non-repeating character. Example: 'swiss' returns 'w'.

• Case Sensitivity: Cons...read more

Out is used for returning multiple values from a method, while ref is used for passing a variable by reference.

• Out parameters must be assigned a value inside the method before it returns.

• Ref parameters must be initialized before passing them to a method.

• Out parameters are used when a method needs to return multiple values.

• Ref parameters are used when a method needs to modify the value of the parameter.

• Example: int.TryP...read more

Use a SQL query with ORDER BY and LIMIT to find the 2nd last student marks.

• Use ORDER BY clause to sort the marks in descending order

• Use LIMIT 1,1 to skip the last row and fetch the 2nd last row

Create a global exception handler to manage all unhandled exceptions in the application.

• Implement a global exception handler class that extends ExceptionHandler.

• Override the uncaughtException method to handle all unhandled exceptions.

• Log the exception details and notify the user about the error.

• Consider implementing different strategies for handling different types of exceptions.

• Test the global exception handler thorou...read more

Projects are specific tasks or assignments that require a team to work together to achieve a common goal.

• Projects involve a defined scope, timeline, and budget.

• They require a team of individuals with different skills and expertise.

• Examples include developing a new software application, implementing a new system, or conducting a research study.

I have worked on a variety of tech stacks including Java Spring, React, Node.js, and MongoDB.

• Java Spring

• React

• Node.js

• MongoDB

Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract f...read more