HCLTech Interview Questions, Process, and Tips

Remove duplicates from a list of employee objects based on empID using streams

• Use Java streams to group the employee objects by empID

• Use a collector to collect the grouped objects and get the values as a list

• Convert the list back to a stream and collect it to a new list

Code snippets for controller, service, and DAO layers to retrieve employee by ID

• Controller layer: Create a method to handle GET request for employee by ID

• Service layer: Implement logic to retrieve employee by ID from DAO layer

• DAO layer: Write query to fetch employee by ID from database

I am a passionate Java Developer with 5 years of experience in developing web applications and implementing software solutions.

• 5 years of experience in Java development

• Strong knowledge of web application development

• Experience in implementing software solutions

• Passionate about coding and problem-solving

I am responsible for developing and maintaining Java applications for our company's internal systems.

• Developing new features and functionalities for Java applications

• Fixing bugs and issues in existing Java code

• Collaborating with team members to design and implement solutions

• Performing code reviews and testing

• Optimizing application performance

Jagged arrays are arrays of arrays where each element can be of different sizes.

• Jagged arrays are useful when you need to store arrays of different lengths.

• Each sub-array within a jagged array can have a different number of elements.

• Example: string[][] jaggedArray = new string[3][]; jaggedArray[0] = new string[2]; jaggedArray[1] = new string[3]; jaggedArray[2] = new string[4];

if else is used for conditional statements with multiple conditions, while switch is used for selecting one of many options based on a single expression.

• if else allows for multiple conditions to be checked, while switch is used for selecting one option from many

• if else is more flexible as it can handle complex conditions, while switch is more concise for simple comparisons

• switch is often preferred when there are multip...read more

String pool is a cache of unique string literals in Java. Strings are immutable to ensure security, synchronization, and performance.

• String pool is a special memory area in Java heap where unique string literals are stored.

• Strings are immutable in Java to ensure security - once created, their values cannot be changed.

• Immutability also helps in synchronization and performance optimization.

• Example: String str1 = "hello";...read more

I am a recent graduate with a degree in Computer Science and a passion for coding and problem-solving.

• Graduated with a degree in Computer Science

• Skilled in coding and problem-solving

• Passionate about technology and innovation

My college/school percentage is 85%.

• I graduated with a percentage of 85% from XYZ College.

• I scored 85% in my final exams at ABC School.

• My overall percentage throughout college was 85%.

Java code to print all the zeros at the end of the array

• Iterate through the array from the end

• Check if the element is '0'

• Print the element if it is '0'

Java code to print the repeated words in a sentence

• Split the sentence into words using split() method

• Create a HashMap to store word frequency

• Iterate through the words and update the frequency in the HashMap

• Print the words with frequency greater than 1

Java code to print the repeated letters in a given name/words

• Iterate through each character in the input string

• Use a HashMap to store the count of each character

• Print the characters with count greater than 1

Cucumber is a BDD framework that allows writing test cases in simple English sentences.

• Uses Gherkin syntax to write feature files in plain English

• Supports automation testing for behavior-driven development

• Integrates with various programming languages like Java, Ruby, etc.

• Helps in collaboration between technical and non-technical team members

Technical infrastructure refers to the underlying framework that supports the operation of a system or organization.

• Includes hardware, software, networks, and facilities

• Ensures the smooth functioning of technology systems

• Supports communication, data storage, and processing

• Examples: servers, routers, databases, cloud services

Automation in IT industries helps streamline processes, increase efficiency, reduce errors, and save time and resources.

• Automation helps streamline repetitive tasks and workflows, allowing for faster and more efficient processes.

• It reduces the chances of human error, leading to improved accuracy and reliability.

• Automation can save time and resources by completing tasks more quickly and consistently.

• It enables IT profes...read more

Designed and implemented a new cooling system for a manufacturing plant.

• Researched different cooling technologies and their efficiency

• Collaborated with a team of engineers to design the system layout

• Performed simulations to optimize the cooling system performance

• Managed the installation and testing of the new system

Design methodology is a systematic approach to solving engineering problems by following a series of steps.

• Design methodology involves defining the problem, researching, brainstorming solutions, selecting the best solution, prototyping, testing, and refining.

• It helps ensure that the final product meets the desired requirements and functions effectively.

• Examples of design methodologies include Six Sigma, Lean Manufactur

The 3,2,1 principle of GD&T is a method used to establish a datum reference frame for geometric dimensioning and tolerancing.

• 3 points are used to establish a datum plane, 2 points to establish a datum line, and 1 point to establish a datum point.

• The 3,2,1 principle ensures that the part is securely located and oriented in a consistent manner for measurement and manufacturing processes.

• Datum features are used as referen...read more

OOPS concepts in Java refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the implementation detail...read more

Using MultivaluedMap to add a list of values to a particular key in Java

• Create a MultivaluedMap object from Apache Commons Collections library

• Use the put method to add a key-value pair where the value is a list of values

• Use the get method to retrieve the list of values for a particular key