HCLTech Java Developer Interview Questions, Process, and Tips

Q1. Java related question,Memory management,Exception handling,collection framework,pillars of oops,spring boot basic questions.
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Q1. About Project and their Implementation, How you handle exception in application.
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Q2. Advance Java question, Rest API .
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Q1. Basic question about Work Experience of previous organization, salary,Relocation etc.
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Q1. Explain diamond problem in java
Ans. 
Diamond problem occurs in multiple inheritance when a class inherits from two classes that have a common ancestor.
• Occurs in Java when a class inherits from two interfaces that have a common method signature

• Results in ambiguity as to which method implementation should be used

• Can be resolved using default methods in interfaces introduced in Java 8
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Q2. Explain features of java 8
Ans. 
Java 8 introduced several new features including lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions allow for more concise code and easier parallel programming.

• Streams provide a new way to work with collections and perform operations in a functional style.

• Functional interfaces enable the use of lambda expressions.

• Default methods allow interfaces to have method implementations.

• Opt...read more
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Q3. What is functional interface
Ans. 
Functional interface is an interface with only one abstract method, used for lambda expressions.
• Functional interface can have multiple default or static methods, but only one abstract method.

• It is used for lambda expressions and functional programming in Java.

• Examples of functional interfaces in Java are Runnable, Callable, and Comparator.
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Q4. Write a java program using java 8 , Print the name and count the each word in the name
Ans. 
Java program using Java 8 to print name and count each word in the name
• Use Java 8 streams to split the name into words

• Use Collectors.groupingBy to count the occurrences of each word

• Print the name and the count of each word
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Q1. Collection Heirachy
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Q2. Remove duplicate from a list of employee object based on empID using streams
Ans. 
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
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Q3. Write code for controller, service and DAO layer for getEmployeeByID
Ans. 
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
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Q1. Tell me about yourself
Ans. 
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
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Q2. Work you do in your current company
Ans. 
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
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Q1. Write program to print odd and even number alternatively using 2 threads which contains odd number list and even number list
Ans. 
Program to print odd and even numbers alternatively using 2 threads with separate lists
• Create two separate lists for odd and even numbers

• Use two threads to print numbers alternatively from each list

• Ensure synchronization between threads to avoid race conditions
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Q2. Write program to sort list based on multiple conditions
Ans. 
Program to sort list based on multiple conditions
• Create a custom Comparator class to define the sorting logic

• Implement the compare method to compare objects based on multiple conditions

• Use Collections.sort() method to sort the list using the custom Comparator
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Q1. How to implement multithread in java
Ans. 
Multithreading in Java allows multiple threads to execute concurrently, improving performance and responsiveness.
• Create a class that extends Thread or implements Runnable interface

• Override the run() method with the code to be executed concurrently

• Instantiate the class and call start() method to begin execution

• Use synchronized keyword to handle thread synchronization and prevent race conditions
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Q1. Spring beans how works
Ans. 
Spring beans are Java objects managed by the Spring IoC container. They are defined in the Spring configuration file and are instantiated, assembled, and managed by the container.
• Spring beans are defined in the Spring configuration file using XML or annotations.

• The Spring IoC container is responsible for instantiating, assembling, and managing the beans.

• Beans are singleton by default, but can be configured as prototype...read more
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Technical round and assignment in technical ability

Q1. What is the javascript
Ans. 
JavaScript is a programming language commonly used for creating interactive effects within web browsers.
• JavaScript is a high-level, interpreted programming language.

• It is used to make web pages interactive and dynamic.

• JavaScript code can be embedded directly into HTML pages.

• Commonly used for client-side web development.

• Examples include form validation, interactive maps, and dynamic content updates.
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Q2. What is front developer j
Ans. 
Front-end developers are responsible for creating the user interface and user experience of a website or application.
• Front-end developers use languages like HTML, CSS, and JavaScript to build the visual elements of a website.

• They work closely with designers to implement the visual aspects of a website or application.

• Front-end developers focus on creating a responsive and user-friendly interface for users to interact wi...read more
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Q1. What is javascript
Ans. 
JavaScript is a high-level, interpreted programming language used for creating interactive websites.
• JavaScript is commonly used for client-side web development.

• It can be used to create dynamic and interactive web pages.

• JavaScript can also be used for server-side development with Node.js.

• Examples include form validation, interactive maps, and dynamic content updates.
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Q2. Explain the html
Ans. 
HTML is a markup language used for creating web pages.
• HTML stands for HyperText Markup Language.

• It uses tags to structure content on a web page.

• Common tags include <html>, <head>, <title>, <body>, <p>, <div>, <a>, <img>.

• Attributes can be added to tags to provide additional information.

• HTML can be combined with CSS and JavaScript to create interactive web pages.
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