20+ Interview Questions and Answers

Our code review process involves peer reviews and automated testing. We follow best practices and use manual testing for edge cases.

• Peer reviews are conducted for all code changes before merging into the main branch

• We use automated testing tools like Jest and Enzyme for unit and integration testing

• We follow best practices like writing clean and modular code, using meaningful variable names, and commenting where necessary

• Manual testing is used for edge cases and scenarios that...read more

String Builder is not synchronized and faster, while String Buffer is synchronized and slower.

• String Builder is not thread-safe, while String Buffer is thread-safe.

• String Builder is faster due to lack of synchronization, while String Buffer is slower due to synchronization.

• String Builder is recommended for single-threaded operations, while String Buffer is recommended for multi-threaded operations.

There are two main types of memory in a computer system: stack memory and heap memory.

• Stack memory is used for static memory allocation and is managed by the compiler. It is typically faster but limited in size.

• Heap memory is used for dynamic memory allocation and is managed by the programmer. It is slower but has a larger size.

• Examples: C programming language uses stack memory for function calls and heap memory for dynamic memory allocation.

Angular can be connected with Spring Boot using REST APIs.

• Create REST APIs in Spring Boot to expose data

• Use Angular's HttpClient to make HTTP requests to the APIs

• Parse the response data in Angular and display it in the UI

• Use CORS configuration in Spring Boot to allow cross-origin requests from Angular

To protect a site from spam, implement CAPTCHA, use spam filters, validate user input, and monitor site activity. To create a multi-site, use a content management system with multi-site capabilities.

• Implement CAPTCHA to prevent automated spam submissions

• Use spam filters to detect and block spam content

• Validate user input to ensure data integrity and prevent malicious code injection

• Monitor site activity for suspicious behavior and patterns

• For creating a multi-site, use a conte...read more

Roles and responsibilities of a Senior Software Engineer involve leading technical projects, mentoring junior developers, collaborating with cross-functional teams, and ensuring code quality and scalability.

• Leading technical projects and providing technical guidance to team members

• Mentoring junior developers and helping them grow in their technical skills

• Collaborating with cross-functional teams such as product managers, designers, and QA testers

• Ensuring code quality through ...read more

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

• Lambda expressions: Allow for more concise and readable code by enabling functional programming.

• Streams: Provide a way to work with collections of objects in a more functional style.

• Functional interfaces: Interfaces with a single abstract method, used to enable lambda expressions.

• Optional class: Helps to avoid null pointer exceptions by wrapping a value that may or may not ...read more

Spring boot annotations are used to simplify the development process by providing metadata to the Spring framework.

• 1. @SpringBootApplication - Main annotation to indicate the main class of a Spring Boot application.

• 2. @RestController - Annotation for RESTful web services.

• 3. @Autowired - Dependency injection annotation.

• 4. @GetMapping, @PostMapping, @PutMapping, @DeleteMapping - Annotations for mapping HTTP requests to controller methods.

• 5. @Component, @Service, @Repository - A...read more

To restrict URL access in Angular, use Angular Router Guards.

• Angular Router Guards can be used to restrict access to certain routes based on user authentication or authorization.

• There are three types of guards: CanActivate, CanActivateChild, and CanLoad.

• CanActivate is used to prevent access to a route, CanActivateChild is used to prevent access to child routes, and CanLoad is used to prevent lazy-loaded modules from being loaded.

• Pipes in Angular are used to transform data bef...read more

Interceptors are functions that can intercept and modify requests or responses in an application. Closures are functions that have access to variables in their outer scope.

• Interceptors can be used for logging, authentication, caching, and more.

• Closures are commonly used in JavaScript to create private variables and functions.

• An example of an interceptor in AngularJS is the $httpInterceptor service.

• An example of a closure in JavaScript is a function that returns another functi...read more

String pool is a storage area in memory where strings are stored to optimize memory usage by reusing common strings.

• String pool helps in reducing memory usage by storing only one copy of each unique string.

• Strings created using double quotes are stored in the string pool.

• Strings created using new keyword are not stored in the string pool.

Deployment table is created by designing a database schema with necessary fields to track deployment information.

• Design a database schema with fields like deployment_id, environment, version, date_deployed, deployed_by, etc.

• Use SQL queries to create the deployment table in the database.

• Consider adding indexes on commonly queried fields for performance optimization.

• Implement proper data validation and constraints to ensure data integrity.

• Regularly update the deployment table s...read more

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and dependencies.

• Spring Boot uses an embedded server to run applications

• It provides auto-configuration for commonly used libraries

• It uses annotations to minimize boilerplate code

• It supports various data sources and messaging systems

• It can be easily integrated with other Spring projects

• Example: @SpringBootApplication annotation creates a Spring Boot application

• E...read more

Microservices is an architectural style where an application is composed of small, independent services that communicate with each other.

• Microservices are independently deployable and scalable.

• Each microservice performs a single business capability.

• Communication between microservices is usually through APIs.

• Microservices can be developed using different programming languages and technologies.

• Examples of companies using microservices include Netflix, Amazon, and Uber.

A technical interview is a job interview for positions in the technology industry where candidates are assessed on their technical skills and knowledge.

• Technical interviews typically involve coding challenges, algorithm questions, and system design problems.

• Candidates may be asked to solve problems on a whiteboard, on a computer, or verbally.

• Interviewers may also ask about past projects, technical experience, and problem-solving approaches.

• Technical interviews help employers ...read more

Abstract class is a class that cannot be instantiated, while an interface is a contract that a class must implement.

• Abstract classes can have method implementations, while interfaces cannot

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

• Abstract classes can have constructors, while interfaces cannot

• Interfaces can have default method implementations since Java 8

Import and export are used in JavaScript to share code between files and modules.

• Import is used to bring in code from other modules or files.

• Export is used to make code available for use in other modules or files.

• Import and export are commonly used in modern JavaScript development with tools like Webpack and Babel.

• Examples of import and export syntax include: import { functionName } from './module'; and export default myFunction;

Primary keys (pk) are created to uniquely identify each record in a database table.

• PKs can be created using a single column or a combination of columns.

• PKs must be unique and not null.

• PKs can be automatically generated (e.g. using auto-increment) or manually assigned.

• PKs are essential for data integrity and efficient data retrieval.

Protocols are rules for communication between devices, while WLM stands for Workload Management.

• Types of protocols include HTTP, TCP/IP, FTP, SMTP, etc.

• WLM involves managing the distribution of workloads across resources efficiently.

• Examples of WLM tools include IBM Workload Scheduler, Oracle Enterprise Manager, etc.

Longest common subsequence is the longest sequence of characters that appear in the same order in both strings.

• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of longest common subsequences of substrings.

• Traverse the array to find the longest common subsequence.

PTLC stands for Project Time and Cost Management. It involves phases like initiation, planning, execution, monitoring/control, and closure.

• Initiation phase involves defining the project at a broad level.

• Planning phase involves creating a detailed project plan.

• Execution phase involves carrying out the project plan.

• Monitoring/control phase involves tracking, reviewing, and regulating the progress and performance of the project.

• Closure phase involves closing the project and docu...read more