Infosys Interview Questions, Process, and Tips

Q1. One round interview
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Q2. Good questions
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Q1. Good questions on Tableau
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Q2. Good questions on visualization
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Easy question asked and aptitude where medium level.

Q1. What is object?
Ans. 
An object is a data structure that contains data in the form of fields or properties, which can be manipulated through methods.
• Objects are instances of classes in object-oriented programming.

• They have attributes (fields) and behaviors (methods).

• Examples include a car object with attributes like color and model, and behaviors like drive and stop.
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Q2. What is class?
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In object-oriented programming, a class is a blueprint for creating objects (instances) with similar attributes and behaviors.
• Classes define the properties (attributes) and methods (behaviors) that objects created from the class will have.

• Objects are instances of a class, each with its own unique data but sharing the same structure and behavior.

• Inheritance allows classes to inherit attributes and methods from a parent ...read more
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Q1. Difference between select single and select single up to 1 row
Ans. 
Select single retrieves exactly one row, while select single up to 1 row retrieves at most one row.
• Select single is used when exactly one row is expected to be retrieved.

• Select single up to 1 row is used when at most one row is expected to be retrieved.

• Select single throws an error if more than one row is found, while select single up to 1 row does not.
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Q2. RAP
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Q1. What is the difference between an interface and an abstract class?
Ans. 
Interface is a contract that defines the methods a class must implement, while abstract class can have both implemented and abstract methods.
• Interface can only have abstract methods and constants, while abstract class can have both abstract and non-abstract methods.

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

• Interfaces are used to achieve multiple inheritance in Java, while ab...read more
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Q2. What is the immutability of strings, and what are the differences between the StringBuffer and StringBuilder classes?
Ans. 
Immutability of strings means they cannot be changed once created. StringBuffer is synchronized while StringBuilder is not.
• Strings are immutable in Java, meaning their values cannot be changed once they are created.

• StringBuffer is synchronized, making it thread-safe but slower. StringBuilder is not synchronized, making it faster but not thread-safe.

• StringBuffer is preferred for use in multi-threaded environments, while...read more
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Q3. What is the process to create an immutable class?
Ans. 
To create an immutable class, make the class final, make all fields private and final, provide only getter methods, and ensure no mutator methods.
• Make the class final to prevent subclassing.

• Make all fields private and final to prevent modification.

• Provide only getter methods to access the fields.

• Ensure no mutator methods to change the state of the object.
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Q1. Can you describe your previous project, including the work structure and monitoring practices?
Ans. 
Managed a project to implement a new CRM system for a large retail company.
• Work structure involved defining project scope, creating a timeline, assigning tasks to team members, and conducting regular status meetings.

• Monitoring practices included tracking progress against milestones, identifying and addressing any issues or delays, and providing regular updates to stakeholders.

• Utilized project management software to tra...read more
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Q1. Versions used in tomcat and springboot
Ans. 
Tomcat and Spring Boot versions are independent of each other, but they can be compatible with each other.
• Tomcat versions can range from 7.x to 10.x, with the latest stable version being 10.0.12.

• Spring Boot versions are typically aligned with Spring Framework versions, with the latest stable version being 2.5.4.

• It is important to ensure compatibility between the Tomcat and Spring Boot versions being used in a project.
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Q2. Unit testing test coverage
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Q1. Salary discussions and location
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