HCLTech Interview Questions, Process, and Tips for Freshers

Similar to all company exams have aptitude and some coding questions

Q1. Things that were in your resume were asked.. Easy to medium
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Q1. Personality questions were asked that's it
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Q1. There is a string input that is email address. You have to print the email id such that before @ few letters should be replaced with star.
Ans. 
Replace few letters before @ in email id with star and print the email id.
• Identify the position of @ in the email address

• Replace few letters before @ with *

• Print the modified email id
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Q2. Find Fibonacci sequence?
Ans. 
Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones.
• The sequence starts with 0 and 1, and each subsequent number is the sum of the previous two numbers.

• The first ten numbers in the Fibonacci sequence are: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34.

• The Fibonacci sequence has many applications in mathematics, science, and nature.
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Q1. Relocation, etc
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Moderate difficulty easy to crack not much effort needed

Jusylt your nrmal final yr projects are enough

Q1. Internal workings of HashMap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap uses an array of linked lists to store key-value pairs.

• The key is hashed to determine the index in the array where the value will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap allows one null key and multiple null values.

• Example: HashMap
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Q2. Constructor overloadings
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Q1. Linked list vs array list
Ans. 
Linked list is dynamic in size, allows for efficient insertion/deletion. Array list is fixed in size, allows for random access.
• Linked list is efficient for insertion/deletion due to dynamic size.

• Array list is efficient for random access due to fixed size.

• Linked list uses pointers to connect elements, while array list uses indexes.

• Example: Linked list is used in applications where frequent insertions/deletions are requi...read more
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Q2. Overriding vs Overloading
Ans. 
Overriding is when a subclass provides a specific implementation of a method in its superclass, while overloading is when multiple methods have the same name but different parameters.
• Overriding involves changing the behavior of a method in a subclass, while overloading involves creating multiple methods with the same name but different parameters.

• Overriding is used for runtime polymorphism, while overloading is used fo...read more
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