HCL Infosystems Technical Trainer Interview Questions and Answers

Q1. What is abstract class? Why we require abstract class?
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods. It is used for defining a common interface.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Used for defining a common interface for a group of related classes
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Q2. What is the difference between abstract class and interfaces?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract class can have constructors, member variables, and methods, while interfaces cannot.

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

• Abstract classes are used to define a common base class for related classes, while interfaces are used to define a contract for cl...read more
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Q1. Discuss 4 case study related to supply chain management.
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Round duration - 140 minutes
Round difficulty - Medium

Test timing was at 2:00 pm , it was conducted in a college and the environment was good for the test. Camera was a primary part of test, so no suspicious activity.

Q1. 
Sum of Two Numbers Represented as Arrays
Given two numbers in the form of two arrays where each element of the array represents a digit, calculate the sum of these two numbers and return this sum as an ar...read more
Ans. 
Given two numbers represented as arrays, calculate their sum and return the result as an array.
• Iterate through the arrays from right to left, adding digits and carrying over if necessary

• Handle cases where one array is longer than the other by considering the remaining digits

• Ensure the final sum array does not have any leading zeros
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Round duration - 20 minutes
Round difficulty - Easy

The round was conducted at around 12 p.m. I was called at the college location and then it was conducted. The interviewer was quite polite and frank.

Round duration - 8 minutes
Round difficulty - Easy

This round was conducted right after finishing and clearing the technical round at the same place and on the same day.