HCL Technical Interview Questions
HCL Technical Interview Questions and Answers 2023
On this page, you will find the recently asked technical interview questions and answers in the HCL Interview 2023.
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- HCL Test Pattern
- Top 20 HCL Technical Interview Questions
HCL Technical Interview Questions
Question 1: What is meant by class access modifiers?
Answer:
In object-oriented languages, access modifiers are keywords that control the accessibility of classes, methods, and other members. Access modifiers are a type of programming language syntax that is used to help with component encapsulation.
Question 2:- What is deadlock? How do you avoid it?
Answer:
A deadlock occurs when two computer programs that are sharing the same resource effectively block one another from accessing the resource, rendering both programs unusable. The first computer operating systems only allowed one program to run at a time.
Deadlock can be avoided by removing any of the four required conditions: mutual exclusion, hold and wait, no preemption, and circular wait.
Question 3: Write a code for finding the maximum number of handshakes.
Questions 4: What is a foreign key?
Answer:
A foreign key is a field in one table that references the primary key in another table. The table containing the foreign key is referred to as the child table, whereas the table containing the main key is referred to as the referenced or parent table.
Question 5: What do you mean by threads in Operating System?
Answer:
A thread is the lowest unit of processing that an operating system can support. A thread resides within a process in most current operating systems, which means that a single process may include numerous threads.
Question 6: What is the function of the I/O library in C++?
Answer:
The input/output library in the C++ programming language refers to a group of class templates and auxiliary functions in the C++ Standard Library that enable stream-based input/output functionalities. It is a FILE-based stream alternative to the C standard library’s object-oriented streams.
Question 7: What is exception handling?
Answer:
Exception Handling in Java is one of the most effective ways to manage runtime failures while keeping the application’s regular flow intact. The Java Exception Handling mechanism handles runtime faults.
Question 8: Write a program to print ASCII code for a character using JAVA.
//Java program to print ASCII values of a character
import java.util.Scanner;
class Main
{
public static void main(String[] args)
{
//scanner class object creation
char c='A';
//typecasting from character type to integer type
int i = c;
//printing ASCII value of the character
System.out.println("ASCII value of "+c+" is "+i);
}
}
Questions 9: What is a thread?
Answer:
A thread is a small collection of instructions meant to be scheduled and executed by the CPU independently of the parent process in computer programming.
Question 10: What do you understand by abstract classes?
Answer:
Abstract classes are required to provide an abstraction to the code in order for it to be reusable and expandable.
Question 11: What is a peep stack?
Answer:
Peek Stack () is a stack function, also known as an operation. It returns the value of the stack’s topmost element without removing it from the stack.
Question 12: Define whitespace in C++.
Answer:
Whitespace is a term used to describe characters that are utilized for formatting. In C++, this generally pertains to spaces, tabs, and newlines. With a few notable exceptions, the C++ compiler normally ignores whitespace.
Question 13: What is the order of B+ tree?
Answer:
A B+ tree of order m is a search tree with up to m children for each non-leaf node. The actual components of the collection are stored in the tree’s leaves, whereas the non-leaf nodes hold just keys.
Question 14: Define access specifiers.
Answer:
Access specifiers describe how members of a class, such as attributes and methods, can be accessed.
Question 15: What is AI?
Answer:
Artificial intelligence is defined as the theory and development of computer programs capable of performing tasks and solving issues that normally require human intelligence.
Question 16: What are BLOCK statements in SQL?
Answer:
A block is the smallest significant collection of code in SQL, as it is in most other procedural languages. A block is a unit of code that supports variable declaration and exception handling with execution and scoping boundaries.
Question 17: Does every class require a constructor?
Answer:
Yes. The fundamental objective of the constructor is to initialize an object, often known as the object initialization operation. As a result, the presence of a constructor is required for all classes.
Question 18: Write a program for converting binary to octal numbers.
Question 19: What is polymorphism?
Answer:
It is absolutely remarkable in its ability to construct many diverse shapes with only one use of a function. The term merely implies this because poly means many or several times and morphism denotes shapes. As a result, its primary function in the Java programming language is to process many sorts of classes and objects via a single piece of an interface, which distinguishes it.
Question 20: Name some aggregate functions.
Answer:
The following are some aggregate functions:
- AVG()
- MAX()
- MIN()
- COUNT()
- SUM()
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