Barclays Global Service Centre Fullstack Java Developer Interview Questions and Answers

Q1. Question related in resume skills and for company improvement knowledge
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Q2. Personal information
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4 senior interviewer in group discus

Q1. Introduce yourself ?
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Q2. What are the courses you are familiar with ?
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Q3. Explain oops concept in java
Ans. 
OOPs concept in Java is a programming paradigm that focuses on objects and their interactions.
• OOPs stands for Object-Oriented Programming.

• It involves the use of classes, objects, inheritance, polymorphism, and encapsulation.

• Classes are blueprints for creating objects, and objects are instances of classes.

• Inheritance allows classes to inherit properties and behaviors from other classes.

• Polymorphism allows objects of dif...read more
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Q4. Write a palindrome program in java
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A palindrome program in Java checks if a given string is the same when read forwards and backwards.
• Convert the string to lowercase to ignore case sensitivity.

• Use two pointers, one starting from the beginning and the other from the end of the string.

• Compare the characters at the two pointers, moving them towards the center until they meet or cross each other.

• If at any point the characters are not equal, the string is no...read more
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Q5. Create a table questions in mysql
Ans. 
Creating a table named 'questions' in MySQL.
• Use the CREATE TABLE statement to create the table.

• Specify the table name, column names, and their data types.

• Set primary key, foreign key, and other constraints if required.

• Add any additional properties like auto-increment, default values, etc.

• Execute the SQL statement to create the table.
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Q1. Java common question on hashmap, stream api
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Q1. A senior in my current team was asking questions. He was helping to complete my answers. Be prepared with oops, collection, thread concepts, spring, hibernate basics thoroughly.
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Q1. Tell me about internal working of JVM
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Q2. Tell me about SAGA pattern in Microservices
Ans. 
SAGA pattern is a design pattern used in microservices architecture to manage distributed transactions.
• SAGA pattern breaks down a long-running transaction into a series of smaller, independent transactions.

• Each step in the SAGA pattern is a separate service that communicates with other services through events.

• If a step fails, compensating transactions are executed to rollback the changes made by previous steps.

• Example:...read more
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Q1. Tell me about your current project structure
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Q2. What is an API , how would you secure an API
Ans. 
API stands for Application Programming Interface. It defines the methods and data formats that applications can use to communicate with each other.
• API is a set of rules and protocols that allows different software applications to communicate with each other.

• To secure an API, you can use authentication methods like OAuth, API keys, or JWT tokens.

• Implementing encryption (HTTPS) and rate limiting can also enhance API secu...read more
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Q1. Why do you want to relocate to Bangalore
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Q2. Tell me about one instance where you faced pressure and how did you overcome ?
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General aptitude, logical reasoning, english and Pseudocodes

Q1. Self introduction Project- details, role Programming- Variables, recursion, Features,Arrays, strings, write prime number program.
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Q1. Java api calling from angular application and all security and integration related question.
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Q2. Project structure related question
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Q1. Project structure design patterns
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Q1. Java basics with oops concepts
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