200+ Interview Questions and Answers

The @Controller annotation is used to create a controller in Spring MVC, while @RestController is used to create RESTful web services.

• Controller is used to create web pages, RestController is used to create RESTful web services

• @Controller returns the view, @RestController returns the object and data directly

• @RestController is a specialization of @Controller

Microservices are a software development technique where applications are broken down into smaller, independent services that work together.

• Microservices are small, independent services that focus on specific business functions.

• Each microservice can be developed, deployed, and scaled independently.

• Microservices communicate with each other through APIs.

• They promote flexibility, scalability, and faster development cycles.

• Examples of companies using microservices include Netflix...read more

Azure Functions are serverless compute services that allow you to run event-triggered code without managing infrastructure.

• Azure Functions are event-driven, meaning they execute in response to events like HTTP requests, timers, or messages from other Azure services.

• They are serverless, meaning you only pay for the time your code runs and Azure automatically scales to meet demand.

• Azure Functions support multiple programming languages like C#, JavaScript, Python, and more.

• They ...read more

Storage Queues are a type of service provided by cloud platforms to store and process messages in a queue.

• Storage Queues help in decoupling components of a cloud application by allowing them to communicate asynchronously.

• They are commonly used for tasks like processing messages, creating workflows, and handling background jobs.

• Examples of cloud platforms offering Storage Queues include Azure Queue Storage and Amazon Simple Queue Service (SQS).

Decorators and directives are features in programming languages that allow for the modification or extension of code behavior.

• Decorators are used in languages like Python to modify the behavior of functions or classes.

• Directives are used in AngularJS to add behavior to HTML elements.

• Decorators in Python are denoted by the @ symbol, like @staticmethod.

• Directives in AngularJS are denoted by attributes in HTML tags, like ng-model.

Optimizing code, database queries, and server performance can improve overall application performance.

• Optimize code by reducing unnecessary loops and improving algorithm efficiency

• Optimize database queries by using indexes, avoiding unnecessary joins, and caching query results

• Optimize server performance by using load balancing, caching static content, and optimizing server configurations

A stream function with a predicate is used to filter elements from a stream based on a condition.

• Use the filter() method to apply the predicate to each element in the stream.

• The predicate should return true for elements that should be included in the filtered stream.

• Example: stream.filter(element -> element > 5) will filter out elements less than or equal to 5.

Routing determines the path a request takes to reach its destination, while rate routing involves determining the best path based on cost or other factors.

• Routing is the process of selecting a path for data packets to travel from the source to the destination.

• Rate routing involves selecting the best path based on factors like cost, quality of service, or other criteria.

• Routing is typically used in networking to direct traffic, while rate routing is often used in telecommunica...read more

Cloud computing is the delivery of computing services over the internet, including storage, servers, databases, networking, software, and more.

• Cloud computing allows users to access resources on-demand without the need for physical infrastructure.

• Examples of cloud services include Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform.

• Cloud computing offers scalability, flexibility, cost-effectiveness, and increased collaboration.

• Types of cloud computing includ...read more

Containers are lightweight, portable, and self-sufficient packages that contain everything needed to run a piece of software. Artifacts are the output of a build process.

• Containers are isolated environments that package an application and its dependencies together.

• Artifacts are the result of a build process, such as compiled code, libraries, or configuration files.

• Containers can be run on any system that supports the containerization technology used, such as Docker or Kuberne...read more

Developing an application involves planning, designing, coding, testing, and deploying the software.

• Understand the requirements and objectives of the application

• Design the user interface and user experience

• Write code using programming languages like Java, Python, or Swift

• Test the application for bugs and errors

• Deploy the application to app stores or servers

Code analysis involves reviewing and understanding the code to identify issues and improve its quality.

• Start by reviewing the code structure and organization

• Check for syntax errors and logical issues

• Use tools like debuggers and profilers to identify performance issues

• Review the code for security vulnerabilities

• Collaborate with other developers to get feedback and improve the code

P2P cycle refers to procure-to-pay cycle, which involves the process of obtaining goods or services from a supplier and paying for them.

• The cycle starts with the need for goods or services, followed by identifying suppliers and negotiating terms.

• Purchase orders are created, goods are received, and invoices are processed for payment.

• The final step involves reconciling payments and closing out the transaction.

• Example: A company needs to purchase office supplies, so they identif...read more

Thread lifecycle includes new, runnable, running, blocked, and terminated states.

• Thread is created in 'new' state

• Thread becomes 'runnable' when start() method is called

• Thread enters 'running' state when CPU starts executing its run() method

• Thread can be 'blocked' when waiting for a resource or I/O operation

• Thread reaches 'terminated' state when run() method completes or stop() method is called

Yes, I can debug CDS views by using tools like SQL Trace and ABAP Debugger.

• Use SQL Trace to analyze the SQL statements executed by the CDS view

• Use ABAP Debugger to step through the code and analyze variables

• Check for any syntax errors or logical errors in the CDS view definition

Optimizing SQL code involves using indexes, minimizing data retrieval, avoiding unnecessary joins, and optimizing queries.

• Use indexes on columns frequently used in WHERE clauses

• Minimize data retrieval by selecting only necessary columns

• Avoid unnecessary joins by using EXISTS or IN clauses instead

• Optimize queries by using appropriate functions and operators

To create a branch, use version control system commands like git branch.

• Use 'git branch' command to create a new branch in Git.

• Specify the branch name after the command, e.g. 'git branch new-feature'.

• To switch to the newly created branch, use 'git checkout new-feature'.

I prioritize tasks based on deadlines, importance, and impact on overall project goals.

• Identify deadlines for each task and prioritize based on urgency

• Consider the importance of each task in relation to project goals

• Assess the impact of completing each task on the overall project timeline

• Use tools like task management software or to-do lists to organize and prioritize tasks

Redux Saga offers more flexibility and control over asynchronous actions compared to Thunk.

• Redux Saga allows for more complex asynchronous flows with generators.

• Redux Saga provides better error handling capabilities.

• Redux Saga enables easier testing of asynchronous logic.

• Redux Thunk is simpler and easier to grasp for smaller projects.

Agile framework is a project management approach that emphasizes flexibility, collaboration, and iterative development.

• Agile framework involves breaking down projects into smaller tasks and completing them in short iterations called sprints.

• It prioritizes customer feedback and collaboration among team members.

• Common agile methodologies include Scrum, Kanban, and Extreme Programming (XP).

The final keyword in Java is used to restrict the user from changing the value of a variable, making it constant.

• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be extended

C programming is a high-level programming language used for developing system software and applications.

• C programming is a procedural language with a rich set of built-in functions.

• It is widely used for developing operating systems, compilers, and embedded systems.

• C programs are written in text files with .c extension and compiled using a compiler like GCC.

• Example: printf("Hello, World!");

Code to fetch data from an API

• Use a library like Axios or Fetch to make HTTP requests

• Parse the response data in JSON format

• Handle any errors or exceptions that may occur

Closures in JS are functions that have access to their own scope, as well as the outer function's scope.

• Closures allow for maintaining state in an asynchronous environment.

• They can be used to create private variables and functions.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

Primitive data types are basic data types provided by a programming language to represent simple values.

• Primitive data types include integers, floating point numbers, characters, booleans, etc.

• Examples: int x = 5; float y = 3.14; char c = 'a'; boolean flag = true;

I deploy Angular applications using the Angular CLI and various hosting services.

• Use Angular CLI to build the application

• Choose a hosting service like Firebase, Netlify, or AWS for deployment

• Configure deployment settings in the hosting service

• Deploy the application using the hosting service's tools

RLS in Power BI stands for Row-Level Security, which allows you to restrict access to certain data based on user roles.

• RLS helps control access to data at the row level

• It allows you to define rules to restrict data based on user roles

• RLS is commonly used in Power BI to ensure data security and privacy

• Example: You can use RLS to only allow managers to see sales data for their region

I have learned about JavaScript's syntax, functions, DOM manipulation, event handling, AJAX, and ES6 features.

• Syntax and basic concepts like variables, data types, operators

• Functions and scope, including arrow functions and callbacks

• DOM manipulation to interact with HTML elements

• Event handling for user interactions

• AJAX for asynchronous data retrieval

• ES6 features like classes, modules, and promises

Multiple inheritance in programming allows a class to inherit attributes and methods from more than one parent class.

• Create a class that inherits from two or more parent classes

• Use super() to call the constructors of the parent classes

• Avoid diamond problem by using interfaces or mixins

Costs flow in SAP PM maintenance order involves various elements such as labor, materials, external services, and overhead costs.

• Labor costs are associated with the work performed by internal employees on the maintenance order.

• Materials costs include the cost of parts and supplies used in the maintenance work.

• External services costs are incurred when external vendors are used for specific tasks within the maintenance order.

• Overhead costs cover indirect expenses such as utilit...read more

OAuth 2.0 is implemented by registering your application with the OAuth provider, obtaining client credentials, and using authorization codes to access resources.

• Register your application with the OAuth provider to obtain client credentials

• Use authorization codes to request access tokens for accessing protected resources

• Implement the OAuth 2.0 flow in your application to handle authentication and authorization

JUnit is a popular Java testing framework used for unit testing.

• Create a test class with test methods annotated with @Test

• Use assertions to verify expected results

• Run tests using a test runner like JUnitCore or IDE integration

Swagger can be implemented by adding annotations to API code and generating documentation using Swagger tools.

• Add Swagger annotations to API code to describe endpoints, parameters, responses, etc.

• Use Swagger tools like Swagger UI or Swagger Editor to generate interactive API documentation.

• Integrate Swagger into the development workflow to ensure API documentation stays up to date.

Hierarchy in Talend refers to the organization of data flow components in a job.

• Hierarchy is important for understanding the flow of data in a job.

• Components can be organized into subjobs and routines for better organization.

• Hierarchy can be viewed and edited in the Talend Studio interface.

• Example: A job may have a parent job with multiple child subjobs for different tasks.

Annotation used in Spring Boot to enable the application to be run from a main method.

• Used to mark a class as the main entry point for a Spring Boot application

• Eliminates the need for a traditional main method

• Can be used in combination with @SpringBootApplication annotation

Closure is a function that has access to its own scope, as well as the scope in which it was defined.

• Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

• It is created whenever a function is defined within another function.

• Closure is commonly used in event handlers, callbacks, and asynchronous code.

Deadlock is a situation in which two or more processes are unable to proceed because each is waiting for the other to release a resource.

• Occurs in multitasking environments

• Caused by a circular wait for resources

• Can be resolved by prevention or detection algorithms

• Example: Process A holds Resource 1 and waits for Resource 2, while Process B holds Resource 2 and waits for Resource 1

A linked list is a data structure where each element points to the next element in the sequence.

• Consists of nodes where each node contains data and a reference to the next node

• Can be singly linked (each node points to the next node) or doubly linked (each node points to the next and previous nodes)

• Allows for dynamic size and efficient insertion/deletion operations

Immutability refers to the state of an object or data structure that cannot be modified after it is created.

• Immutable objects cannot be changed once they are created

• Immutability ensures data integrity and thread safety

• Examples include strings in Java, tuples in Python

Hooks are functions that allow developers to use state and other React features in functional components.

• Hooks were introduced in React 16.8 to allow developers to use state and other React features in functional components.

• Some commonly used hooks include useState, useEffect, useContext, and useReducer.

• Hooks are used to add functionality to functional components without the need for class components.

Parallel cursor method is a technique used in database programming to improve performance by processing multiple rows simultaneously.

• Parallel cursor method allows multiple rows to be fetched and processed concurrently, reducing overall processing time.

• It is commonly used in scenarios where large datasets need to be processed efficiently.

• By leveraging parallel cursor method, developers can optimize database operations and improve application performance.

ECC is the older version of SAP's ERP system, while S4 HANA is the newer, more advanced version with in-memory computing capabilities.

• ECC is based on traditional disk-based databases, while S4 HANA utilizes in-memory computing for faster data processing.

• S4 HANA offers real-time analytics and predictive capabilities, while ECC does not.

• S4 HANA simplifies data models and processes, making it more efficient than ECC.

• S4 HANA is designed to run on SAP's HANA database platform, whi...read more

Improving Spring Security involves regular updates, strong password policies, implementing multi-factor authentication, and monitoring for suspicious activity.

• Regularly update Spring Security to the latest version to patch any vulnerabilities

• Implement strong password policies, such as requiring complex passwords and regular password changes

• Enable multi-factor authentication to add an extra layer of security for user logins

• Monitor logs and set up alerts for suspicious activity...read more

Reverse a sentence in JavaScript

• Split the sentence into an array of words

• Use the reverse() method to reverse the array

• Join the reversed array back into a string

Different types of indexes include clustered, non-clustered, unique, and composite indexes.

• Clustered index: Physically reorders the data in the table based on the index key. Only one per table.

• Non-clustered index: Creates a separate structure for the index, allowing for multiple indexes per table.

• Unique index: Ensures that the indexed columns do not contain duplicate values.

• Composite index: Index that consists of multiple columns to improve query performance for specific quer...read more

Creating a pipeline involves defining a series of tasks or steps to automate the process of moving data or code through various stages.

• Define the stages of the pipeline, such as data extraction, transformation, and loading (ETL)

• Select appropriate tools or platforms for each stage, such as Jenkins, GitLab CI/CD, or Azure DevOps

• Configure the pipeline to trigger automatically based on events, such as code commits or scheduled intervals

• Monitor and optimize the pipeline for perfor...read more

Some difficulties faced during project completion include scope changes, resource constraints, and technical challenges.

• Scope changes: Clients may request additional features or changes mid-project, leading to delays and rework.

• Resource constraints: Limited budget or manpower can hinder progress and result in longer timelines.

• Technical challenges: Complex coding requirements or integration issues can cause setbacks and require additional time for troubleshooting.

Decorators in Python are functions that modify the behavior of other functions.

• Decorators are defined using the @decorator_name syntax before the function definition.

• They can be used to add functionality to existing functions without modifying their code.

• Decorators can be used for logging, timing, authentication, etc.

• Example: def my_decorator(func): def wrapper(): print('Something is happening before the function is called.') func() print('Something is happening after the fun...read more

Data manipulations using pyspark involve processing and transforming large datasets using the PySpark framework.

• Use PySpark functions like select, filter, groupBy, and join to manipulate data

• Utilize RDDs (Resilient Distributed Datasets) and DataFrames for data processing

• Perform common data manipulations like aggregation, sorting, and cleaning using PySpark

• Example: df.select('column1', 'column2').filter(df['column3'] > 10).groupBy('column1').count()

Functional classes are classes in object-oriented programming that contain only static methods and do not have any instance variables.

• Functional classes are used to group related utility methods together.

• They do not require an instance to be created in order to use their methods.

• Functional classes are commonly used for organizing helper functions or constants.

• Examples include Math class in Java or StringUtils class in Apache Commons library.

Qualification refers to the skills, knowledge, and experience required for a specific job or task.

• Qualifications can include education, certifications, work experience, and specific skills related to the job.

• For example, a qualification for an Application Developer may include a degree in computer science, experience with programming languages, and knowledge of software development.

• Employers use qualifications to determine if a candidate is suitable for a particular role.

• Qual...read more

OOPs in Java stands for Object-Oriented Programming concepts which include inheritance, encapsulation, polymorphism, and abstraction.

• OOPs in Java stands for Object-Oriented Programming concepts

• Includes inheritance, encapsulation, polymorphism, and abstraction

• Encourages modular and reusable code

• Example: Class Animal with subclasses Dog and Cat showcasing inheritance

Data structures are ways of organizing and storing data in a computer so that it can be accessed and used efficiently.

• Data structures define the way data is stored, accessed, and manipulated in a computer program.

• Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.

• Choosing the right data structure is important for optimizing the performance of a program.

Large datasets can be managed by using efficient data storage techniques, data indexing, data partitioning, and utilizing parallel processing.

• Utilize efficient data storage techniques such as using databases optimized for large datasets like Hadoop, MongoDB, or Cassandra

• Implement data indexing to quickly retrieve specific data points without scanning the entire dataset

• Partition large datasets into smaller chunks to distribute the workload and improve query performance

• Utilize ...read more

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.

• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.

Lazy loading is a design pattern where resources are loaded only when needed, improving performance and reducing initial load time.

• Resources are loaded on demand rather than all at once

• Helps improve performance by reducing initial load time

• Commonly used in web development for images or content that is below the fold

Spring is a framework for building Java applications, while Spring Boot is a tool that simplifies the setup and configuration of Spring applications.

• Spring is a comprehensive framework that provides support for various functionalities like dependency injection, aspect-oriented programming, and more.

• Spring Boot is an opinionated tool that simplifies the setup and configuration of Spring applications by providing defaults and auto-configuration.

• Spring Boot reduces the need for ...read more

I have worked on the Angular framework for developing web applications.

• Used Angular CLI for project setup and generation

• Implemented components, services, and modules to build the application

• Utilized Angular Material for UI components

• Integrated with RESTful APIs using HttpClient module

Props are used to pass data from parent to child components, while refs are used to reference a DOM element or a class component instance.

• Props are read-only and cannot be modified by the child component.

• Refs are used to access the DOM nodes or class component instances in React.

• Props are passed down through the component tree, while refs are typically used within a single component.

• Example: for props, and for refs.

Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.

• Currying helps in partial application of functions.

• It allows for creating specialized versions of general functions.

• Example: const add = (a) => (b) => a + b; add(2)(3) returns 5.

An abstract class is a class that cannot be instantiated and is used as a blueprint for other classes to inherit from.

• Cannot be instantiated on its own

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used to define common behavior for subclasses

Dependency inversion principle is a software design principle that states high-level modules should not depend on low-level modules, but both should depend on abstractions.

• High-level modules should not depend on low-level modules, both should depend on abstractions

• Abstractions should not depend on details, details should depend on abstractions

• Helps in achieving decoupling and flexibility in software design

PUT is used to update or replace an existing resource, while POST is used to create a new resource.

• PUT is idempotent, meaning multiple identical requests will have the same effect as a single request.

• POST is not idempotent, meaning multiple identical requests may have different effects.

• PUT is used when the client knows the URI of the resource it wants to update.

• POST is used when the server assigns a URI for the newly created resource.

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that DOM element or even transform the DOM element and its children.

• Directives are used to create custom HTML tags that serve as new, reusable components.

• They can be used to manipulate the DOM, add event listeners, or create animations.

• Examples of directives in AngularJS include ng-model, ng-repeat, and ng-show.

Interceptors are functions that can be used to intercept incoming and outgoing HTTP requests in Angular applications.

• Interceptors can be used to modify or log outgoing requests before they are sent.

• They can also be used to modify or log incoming responses before they are passed to the application.

• Interceptors are commonly used for adding authentication tokens to requests, error handling, or logging.

• An example of using interceptors in Angular is adding a JWT token to the Autho...read more

Optimization in Spark refers to improving the performance of Spark jobs by tuning configurations and utilizing best practices.

• Optimization in Spark involves tuning configurations such as memory allocation, parallelism, and caching.

• Utilizing best practices like partitioning data properly and using efficient transformations can improve performance.

• Examples of optimization techniques include using broadcast variables, avoiding shuffling, and leveraging data locality.

NLP stands for Natural Language Processing, a field of artificial intelligence that focuses on the interaction between computers and humans using natural language.

• NLP involves tasks such as text classification, sentiment analysis, named entity recognition, and machine translation.

• It uses algorithms and models to analyze and understand human language, enabling computers to process, interpret, and generate human language.

• Examples of NLP applications include chatbots, virtual as...read more

Entity Framework Code First approach allows developers to define the model using C# classes and create the database based on the model.

• Developers define the model using C# classes with properties that represent database tables and relationships.

• Database is created based on the model defined in code, without needing to create the database schema first.

• Migrations can be used to update the database schema as the model changes over time.

• Data annotations or Fluent API can be used ...read more

Checklists are essential for ensuring thorough PR reviews

• Include specific criteria for code quality, such as formatting, naming conventions, and performance

• Ensure all tests have been run and pass successfully

• Check for any potential security vulnerabilities or bugs

• Verify that the code aligns with project requirements and goals

To call an API, you need to make a request to the API endpoint using a specific HTTP method.

• Use a tool like Postman or cURL to make API calls

• Include necessary headers and parameters in the request

• Handle the response from the API in your application

An agent pool is a group of agents or workers that are available to perform tasks or jobs in a system.

• Agent pools are commonly used in job scheduling systems to distribute workloads.

• Each agent in the pool can be assigned tasks based on availability and skill set.

• Agent pools can help improve efficiency and scalability in a system.

• Examples: Azure DevOps agent pools, Kubernetes node pools.

Developed a mobile application for tracking daily water intake and setting hydration goals.

• Designed user interface for easy input of water consumption

• Implemented database to store user data and hydration goals

• Integrated notifications to remind users to drink water throughout the day

Use a SQL query with GROUP BY and HAVING clause to find duplicates in a table.

• Use GROUP BY to group rows with the same values together

• Use HAVING COUNT(*) > 1 to filter out non-duplicate rows

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;

RDD stands for Resilient Distributed Dataset and is the fundamental data structure of Spark. DF stands for DataFrame and is a distributed collection of data organized into named columns.

• RDD is an immutable distributed collection of objects, while DF is a distributed collection of data organized into named columns.

• RDD is more low-level and requires the developer to manage the schema and data types, while DF provides a higher-level abstraction with schema inference and optimiza...read more

Strategy 40 is a term used in the software development industry to refer to a specific approach or plan for achieving a goal.

• Strategy 40 typically involves setting clear objectives and milestones for a project.

• It may also involve identifying potential risks and developing contingency plans.

• Examples of Strategy 40 in action include creating a detailed project plan, assigning tasks to team members, and regularly monitoring progress towards goals.

Use the built-in split, reverse, and join methods to reverse a string in JavaScript.

• Split the string into an array of characters using split('')

• Reverse the array using reverse()

• Join the array back into a string using join('')

SAP HANA is an in-memory database platform for real-time analytics and applications, while ECC (Enterprise Central Component) is a traditional ERP system.

• SAP HANA is an in-memory database platform, providing real-time data processing and analytics.

• ECC is a traditional ERP system that relies on disk-based storage for data processing.

• SAP HANA allows for faster data access and processing compared to ECC.

• SAP HANA is designed for real-time analytics and applications, while ECC is ...read more

Annotations in Spring Boot are used to simplify the configuration and development of Spring applications.

• Annotations are used to define the behavior of Spring components, such as controllers, services, and repositories.

• Annotations like @RestController, @Service, and @Repository are commonly used in Spring Boot applications.

• Annotations can also be used for mapping requests to controller methods, handling exceptions, and defining transaction boundaries.

• Annotations like @Autowir...read more

Closures are functions that have access to their own scope, as well as the scope in which they were defined.

• Closures can access variables from their outer function even after the outer function has finished executing.

• Closures can be used to create private variables in JavaScript.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

Object-oriented programming paradigm that focuses on objects and classes for code organization and reusability.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class)

• Inheritance: Ability of a class to inherit properties and behavior from another class

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

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Streams provide a way to work with sequences of elements and perform operations like filter, map, reduce, etc.

• Default methods allow interfaces to have method imple...read more

Selectors used in application development include class, ID, attribute, and pseudo-class selectors.

• Class selectors start with a period (.) and target elements with a specific class name.

• ID selectors start with a hash (#) and target elements with a specific ID.

• Attribute selectors target elements based on their attributes, such as [type='text'] targeting input elements with type 'text'.

• Pseudo-class selectors target elements based on their state or position, such as :hover targe...read more

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow you to write code in a more concise way.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Streams provide a way to work with sequences of elements and perform operations like filter, map, reduce, etc.

• Default methods allow interfaces to have method implementations.

• Ex...read more

Abstract class is a class that can have abstract methods and concrete methods, while interface is a blueprint for a class with only abstract methods.

• Abstract class can have both abstract and concrete methods, while interface can only have abstract methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes can have constructors, while interfaces cannot.

• Interfaces are used to achieve multiple inheritance in Java.

• Example: Abst...read more

Master data refers to the core data that is essential to the operations of a business or organization.

• Master data is the foundational data that is essential for business operations.

• It includes data such as customer information, product details, employee records, etc.

• Master data is typically static and does not change frequently.

• It is used as a reference point for other data within the organization.

• Having accurate and up-to-date master data is crucial for the smooth functionin...read more

I am a passionate Applications Developer with 5 years of experience in developing web and mobile applications.

• 5 years of experience in developing web and mobile applications

• Proficient in programming languages such as Java, JavaScript, and Swift

• Strong problem-solving skills and ability to work in a team

• Experience with Agile development methodologies

• Passionate about staying updated with the latest technologies

A delegate is a type that represents references to methods with a specific parameter list and return type.

• Delegates allow methods to be passed as parameters.

• Delegates can be used to define callback methods.

• Delegates are similar to function pointers in C++.

• Delegates are used in event handling in C#.

Spring is a framework for building Java applications, while Spring Boot is an extension that simplifies the setup and development process.

• Spring is a comprehensive framework that provides support for various Java technologies like JDBC, JPA, and REST.

• Spring Boot is an opinionated framework that simplifies the setup and configuration of Spring applications by providing defaults and auto-configuration.

• Spring Boot includes embedded servers like Tomcat, Jetty, and Undertow, makin...read more

Some exceptions in Spring Boot include NoSuchBeanDefinitionException, BeanCreationException, and InvalidPropertyException.

• NoSuchBeanDefinitionException: Thrown when trying to access a bean that does not exist in the application context.

• BeanCreationException: Thrown when a bean cannot be created due to issues like constructor arguments or dependencies.

• InvalidPropertyException: Thrown when trying to set an invalid property value on a bean.

• IllegalStateException: Thrown when an o...read more

Recursion in triggers refers to a trigger calling itself repeatedly until a certain condition is met.

• Recursion in triggers can be used to perform repetitive tasks on related records.

• Care must be taken to avoid infinite loops by setting a base case or limit.

• Example: A trigger that updates all child records when a parent record is updated.

Mapping load is a technique used in QlikView to load data from multiple tables and map them together.

• Mapping load is used to combine data from different tables based on a common field.

• It helps in creating a mapping table that can be used to associate values from different tables.

• Mapping load is useful for data transformation and data modeling in QlikView.

• Example: Load table1, table2 using mapping load on common field to create a mapping table.

Binary load is a feature in QlikView that allows loading data from one QlikView document into another.

• Binary load is used to load data and script logic from one QlikView document (QVW file) into another.

• It helps in reusing data models, script logic, and data transformations from one QlikView document in another.

• Binary load is achieved using the 'Binary' keyword followed by the path of the QlikView document to be loaded.

• For example, 'Binary [lib://SourceQVW.qvw];' is used to l...read more

BDC in ABAP stands for Batch Data Communication. It is a method used to transfer data from external systems into SAP.

• BDC is used for automating data transfer processes in SAP systems.

• It involves recording the manual steps of a transaction and then playing back the recorded data to automate the process.

• There are two methods of BDC - Call Transaction and Session Method.

• BDC is commonly used for mass data uploads or updates in SAP systems.

Microservice design pattern is an architectural style that structures an application as a collection of loosely coupled services.

• Each service is responsible for a specific business function and can be developed, deployed, and scaled independently.

• Communication between services is typically done through APIs, allowing for flexibility and resilience.

• Microservices promote agility, scalability, and maintainability in large and complex applications.

• Examples of companies using micr...read more

An exception is an event that disrupts the normal flow of a program's execution.

• Exceptions are used to handle errors and other exceptional events in a program.

• They allow the program to continue running even if an error occurs.

• Examples of exceptions include NullPointerException, ArrayIndexOutOfBoundsException, and IOException.

Types of inheritance include single, multiple, multilevel, hierarchical, hybrid, and so on.

• Single inheritance: a class inherits from only one base class.

• Multiple inheritance: a class inherits from more than one base class.

• Multilevel inheritance: a class inherits from a class which in turn inherits from another class.

• Hierarchical inheritance: multiple classes inherit from a single base class.

• Hybrid inheritance: a combination of multiple and multilevel inheritance.

• Example: clas...read more

Oops concepts 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 complex implementation details and showing only the necessary features.

Test plan outlines the scope, approach, resources, and schedule for testing, while test strategy defines the overall testing approach for the project.

• Test plan is a detailed document that specifies the testing scope, objectives, resources, schedule, and approach.

• Test strategy is a high-level document that outlines the overall testing approach for the project.

• Test plan is more detailed and specific to a particular testing phase or level.

• Test strategy is more generic and applie...read more

Annotations in Java are metadata that provide data about a program but do not affect the program itself.

• Annotations start with the @ symbol in Java.

• Annotations can be used to provide information to the compiler or runtime environment.

• Annotations can be used for documentation purposes or to control the behavior of the program.

• Examples of annotations in Java include @Override, @Deprecated, and @SuppressWarnings.