HCLTech Application Developer Interview Questions and Answers

Q1. What is @SpringbootAnnotation and what is difference between @Controller and @RestController.
Ans. 
SpringBootAnnotation is used to enable Spring Boot features in a Java application. @Controller is used for MVC pattern, @RestController is used for RESTful web services.
• SpringBootAnnotation is used to enable Spring Boot features like auto-configuration, component scanning, etc.

• @Controller is used for MVC pattern to handle web requests and return a view, while @RestController is used for RESTful web services to return d...read more
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Q2. What is Stream API write the Stream API Code any code and lambda expression.
Ans. 
Stream API in Java provides a way to process collections of objects in a functional style.
• Stream API allows for easy manipulation of collections using functional programming concepts like map, filter, and reduce.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filter(name -> name.startsWith("A")).forEach(System.out::println);

• Lambda expressions can be used with Stream API to define behavio...read more
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Q1. Explain role and responsibilities in your profile
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Q2. Explain Ansible architecture
Ans. 
Ansible architecture is based on a client-server model where the control machine communicates with managed nodes using SSH.
• Ansible control machine: where playbooks are written and executed

• Managed nodes: machines that are being managed by Ansible

• Inventory: list of managed nodes

• Playbooks: automation scripts written in YAML format

• Modules: reusable units of code that perform specific tasks on managed nodes
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Q3. Difference between cmd and entry point
Ans. 
Cmd is used to specify the default command to run when a container is started, while entry point is used to specify the executable that will run when the container starts.
• Cmd is optional and can be overridden at runtime, while entry point is required and cannot be overridden.

• Cmd is used to provide default arguments for the entry point command.

• Example: CMD ["python", "app.py"] - specifies the default command to run the ...read more
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Q4. How to stop container
Ans. 
To stop a container, use the 'docker stop' command followed by the container ID or name.
• Use 'docker ps' command to list all running containers

• Identify the container ID or name of the container you want to stop

• Run 'docker stop ' to stop the container
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Q1. Explain what are the tool you have been working. mostly open-source software
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Q2. Azure monitor tools and Azure Network issue question
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Q1. What is bussniess rule ?
Ans. 
A business rule is a specific guideline or constraint that dictates how a business operates or makes decisions.
• Business rules are typically defined by stakeholders or subject matter experts.

• They help ensure consistency, compliance, and efficiency in business processes.

• Examples include age restrictions for purchasing alcohol, pricing strategies, and approval processes for expenses.
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Q2. What is update set?
Ans. 
An update set is a group of changes that can be moved from one instance to another in ServiceNow.
• Update sets are used to transport customizations, such as new fields, tables, or scripts, between instances.

• They help in organizing changes and tracking what customizations are being moved.

• Update sets can be previewed, committed, and rolled back if needed.

• Example: Creating a new field in a development instance and moving it
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Q1. About primary keys (how columns can be accommodated in a single primary key)
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Q2. Types of Constructors
Ans. 
Constructors are special methods used to initialize objects in a class.
• Constructors have the same name as the class.

• Types of constructors include default, parameterized, copy, and static constructors.

• Example: public class Person { public Person() { } }
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Q1. What are the differences between a procedure and a function?
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Q2. Write a query to find 3rd highest salary from each department
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Q3. What is synonym.
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Q4. What are the indexes you used ? Diff between bitmap and btree index
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Q1. Boxing Unboxing
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Q2. Abstract class and interface
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2 simple codes were asked.

Q1. Explain microservices architecture in current project
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Q2. Java 8 features
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Q1. Question related to current project.
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Q1. What is memorization
Ans. 
Memorization is the process of committing information to memory for later recall.
• Memorization involves encoding information into memory through repetition or association.

• It is often used in education to learn facts, formulas, or concepts.

• Techniques like mnemonics, visualization, and chunking can aid in memorization.

• Examples include memorizing multiplication tables, historical dates, or foreign language vocabulary.
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Q2. What is currying
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Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of functions, each taking a single argument.
• Currying helps in creating reusable functions and improving code readability.

• It allows partial application of functions, where some arguments are fixed and others are left to be provided later.

• Curried functions can be composed easily to create more complex...read more
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