HCLTech Interview Questions, Process, and Tips for Freshers

Q1. What string pool in java and why string is immutable
Ans. 
String pool is a cache of string literals in Java. String is immutable to ensure security and efficiency.
• String pool is a collection of unique string literals stored in heap memory.

• When a new string is created, JVM checks if it already exists in the pool. If yes, it returns the reference to the existing object.

• String immutability ensures that once a string is created, its value cannot be changed. This ensures security ...read more
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Q2. How we make a class immutable in java
Ans. 
To make a class immutable in Java, we need to follow certain rules.
• Make the class final so that it cannot be extended

• Make all the fields private and final

• Do not provide any setter methods

• If the class has mutable fields, return a copy of the field instead of the original in getter methods

• Ensure that any mutable objects passed to the constructor are not modified outside the class

• Override equals() and hashCode() methods t
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Q3. What is singleton class in java
Ans. 
Singleton class is a class that can have only one instance and provides a global point of access to it.
• Singleton class is used when we need to ensure that only one instance of a class is created throughout the application.

• It is implemented by making the constructor private and providing a static method to get the instance of the class.

• Example: java.lang.Runtime is a singleton class that provides access to the runtime e...read more
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Q4. What is executor in multithreading and what is thread pool
Ans. 
Executor is an interface that executes submitted tasks in a separate thread. Thread pool is a collection of threads that can be reused.
• Executor provides a way to decouple task submission from task execution.

• Thread pool manages a fixed number of threads and assigns tasks to them.

• Executor framework provides a way to manage thread pools.

• Example: Executors.newFixedThreadPool(10) creates a thread pool with 10 threads.

• Exampl...read more
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Q5. Reverse a sentence coding questions and stock price highest profit when it will get kind of questions
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Q6. Web services get ,put,post request
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Q7. More about different status code
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Arthamatic and reasoning

Q1. Accounting basics and TAILLY ERP9 short term goal and long term goal family details
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Q2. Tel me introduce yourself and TALLY ERP9
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Q3. Work experience and working knowledge important
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Q1. Introduction is first, then asked about the capital markets, equity ,and some more questions.
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Q1. Asked about how to send the email in official manner.
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Q1. Tell me about yourself?
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Q2. Why want to join in HCL?
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The Graduate Requisite Exam (GRE), as well as the specialized tests required in order to get into medical (MCAT), law (LSAT), and business graduate programs, are also examples of multiple aptitude tests

Master the basics, Research the company,
Focus on a programming language you're good at

It'll easy u can score good if u have basic knowledge, focus on english

Moderate
You have to solve Pseduco quiz
if u have knowledge about basic coding u can easily clear it

Q1. Based on project, database, oops concept
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Q2. Array,fifo,Lifo,Oops concept,Dbms....
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