Infosys Senior Software Engineer Interview Questions, Process, and Tips

Extension methods allow adding functionality to existing types without modifying them.

• Extension methods are defined in a static class.

• They must be marked with the 'this' keyword before the first parameter.

• They can be called on instances of the extended type as if they were instance methods.

• Extension methods can be used to add functionality to third-party or built-in types.

• Example: 'myString.Reverse()' where 'Reverse' i

The output will depend on the implementation of the method.

• The method may or may not modify the value of the int parameter.

• The method may or may not return a value based on the int parameter.

• Without knowing the implementation of the method, it is impossible to predict the output.

To inherit a partial class, use the 'partial' keyword in both the base and derived classes.

• Use the 'partial' keyword in both the base and derived classes

• Ensure that the partial classes have the same name and are in the same namespace

• Add the necessary code to the derived class to inherit the properties and methods from the base class

The 'using' keyword is used in C# to declare a code block that uses an object and automatically disposes of it when done.

• The 'using' keyword is followed by a set of parentheses that contain the object to be used.

• The object must implement the IDisposable interface.

• The 'using' block ensures that the object is disposed of when the block is exited, even if an exception is thrown.

• Example: using (FileStream fileStream = new ...read more

WebAPIs allow communication between different systems and enable access to data and functionality over the internet.

• WebAPIs provide a standardized way for different systems to communicate with each other over the internet.

• They allow access to data and functionality from remote servers, enabling the creation of web and mobile applications.

• WebAPIs can be used to integrate different systems, such as payment gateways, soci...read more

Yes, DML statements can be written in functions.

• Functions can contain DML statements like INSERT, UPDATE, DELETE.

• Functions can also return values based on the DML statements executed.

• However, functions cannot be used to execute DDL statements like CREATE or ALTER.

Triggers in SQL are special types of stored procedures that are automatically executed in response to certain events.

• Triggers can be used to enforce business rules or data integrity

• They can be executed before or after an INSERT, UPDATE, or DELETE statement

• Triggers can also be used to audit changes to data

• Examples of triggers include sending an email notification when a new record is inserted or updating a related table

To fetch a record from a table, use SELECT statement with appropriate conditions.

• Use SELECT statement with appropriate columns and table name

• Add conditions using WHERE clause to filter the record

• Use LIMIT clause to limit the number of records returned

• Example: SELECT * FROM users WHERE id = 1 LIMIT 1

Inbuilt methods that follow overriding

• In Java, methods that can be overridden are marked with the 'override' keyword

• The overridden method must have the same name, return type, and parameters as the original method

• The 'super' keyword can be used to call the overridden method from the subclass

• Overriding can be used to provide a different implementation of a method in a subclass

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