Barclays Consultant Interview Questions and Answers

Test about 50 questions, 25 technical 25 general logic

Q1. What is semaphores
Ans. 
Semaphores are a synchronization tool used in operating systems to control access to shared resources by multiple processes.
• Semaphores can be used to prevent race conditions in concurrent programming

• They can be either binary (0 or 1) or counting (integer value)

• Operations on semaphores include wait (P) and signal (V)

• Example: Using semaphores to control access to a shared memory buffer
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Q2. Write the code to find prime nos using stream api
Ans. 
Using stream API to find prime numbers in Java
• Use IntStream to generate a stream of numbers

• Filter out non-prime numbers using a custom method

• Check if a number is prime by dividing it by all numbers less than itself
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Q3. Design Patterns in microservices
Ans. 
Design patterns in microservices help in structuring and organizing code for scalability and maintainability.
• Use patterns like Service Registry, Circuit Breaker, and API Gateway for communication between microservices.

• Implement patterns like Saga, CQRS, and Event Sourcing for managing data consistency and scalability.

• Consider patterns like Bulkhead, Retry, and Timeout for fault tolerance and resilience in microservices
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Q4. How to improve performance of website, product
Ans. 
To improve website or product performance, focus on optimizing speed, user experience, and SEO.
• Optimize website loading speed by reducing image sizes and minimizing HTTP requests

• Improve user experience by simplifying navigation and enhancing mobile responsiveness

• Enhance SEO by creating high-quality content, using relevant keywords, and obtaining backlinks
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Q5. Evacuation strategies
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Q6. Advantages of microservices and limitations of rest
Ans. 
Microservices offer scalability and flexibility, while REST has limitations in terms of performance and complexity.
• Microservices allow for independent development and deployment of services, leading to better scalability.

• Microservices promote flexibility and agility in software development by breaking down applications into smaller, manageable components.

• REST APIs can be limited in terms of performance due to multiple ...read more
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Q1. OOPS Concepts of Java
Ans. 
OOPS Concepts of Java include Inheritance, Polymorphism, Encapsulation, and Abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Polymorphism allows objects to be treated as instances of their parent class.

• Encapsulation hides the internal state of an object and only allows access through methods.

• Abstraction focuses on the essential qualities of an object rather than specific deta
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Q2. Collections Hierarchy in Java
Ans. 
Collections hierarchy in Java includes interfaces like List, Set, Map and their implementations like ArrayList, HashSet, HashMap.
• Java collections framework provides interfaces like List, Set, Map

• List interface allows duplicate elements and maintains insertion order, examples are ArrayList, LinkedList

• Set interface does not allow duplicate elements, examples are HashSet, TreeSet

• Map interface stores key-value pairs, examp
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Q1. Everything basics and intermediate level questions
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Q2. Basic coding tasks like factorials. Some basic scenarios for apex
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