BNP Paribas India Solutions Java Developer Interview Questions and Answers

A standard online test conducted through one of the testing platforms.

Q1. Java 8 features
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Q2. Rest API
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Q3. Java 8 coding problem
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Q4. Collections
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Q1. It was based on my previous project
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Q1. Tell me about your project
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Developed a web-based inventory management system for a retail company.
• Used Java, Spring Boot, and MySQL for backend development.

• Implemented user authentication and authorization using Spring Security.

• Designed a responsive front-end using HTML, CSS, and JavaScript.

• Integrated barcode scanning functionality for efficient inventory tracking.
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Q2. Class vs object
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A class is a blueprint or template for creating objects, while an object is an instance of a class.
• A class defines the properties and behaviors of objects, while an object is a specific instance of a class.

• Classes can be used to create multiple objects with similar characteristics.

• Objects have state (attributes) and behavior (methods) defined by the class.

• Example: Class 'Car' defines properties like 'color' and 'model'...read more
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Q1. Salary expectation
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Q2. Date to join?
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Q1. Basics of java like string ,string builder ,Buffer,scp
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Q2. Spring boot annotaions
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Q1. Chvvvv vvbbbbb isush shjshs jdudjdj
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Q2. Vvvhjjjc hhhjVv hsudjsj hsudjsh hdhdh
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Q1. Explain how hashmap internally works
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HashMap internally uses an array of linked lists to store key-value pairs.
• HashMap uses hashing to determine the index of the key in the array.

• If multiple keys hash to the same index, a linked list is used to store them.

• When retrieving a value, the key is hashed to find the index and then the linked list is searched for the key.
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Q2. Difference between vector and Arraylist
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Vector is synchronized and slower, ArrayList is unsynchronized and faster.
• Vector is synchronized, ArrayList is not.

• Vector is slower due to synchronization, ArrayList is faster.

• Vector is legacy class, ArrayList is part of Java Collections framework.

• Vector doubles its size when full, ArrayList increases by 50%.
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Aptitude questions and some questions from PostgreSQL.

Q1. Java fundamental questions?
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Q2. Collection Framework.
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Q3. 2-3 easy to medium Coding Questions.
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Q4. Questions from Object oriented programming in Java?
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Q5. Implementation of HashMap , LinkedList, HashSet, Heap?
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HashMap, LinkedList, HashSet, and Heap are data structures commonly used in Java for storing and organizing data.
• HashMap: key-value pairs, uses hashing to store and retrieve elements efficiently (e.g. HashMap)

• LinkedList: linear data structure, elements are stored in nodes with pointers to the next node (e.g. LinkedList)

• HashSet: collection of unique elements, uses hashing to ensure uniqueness (e.g. Hash...read more
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Q1. How we can achieve load balancing in spring bot
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Load balancing in Spring Boot can be achieved using various techniques such as server-side load balancing, client-side load balancing, and using a load balancer.
• Server-side load balancing can be achieved by using technologies like Ribbon or Eureka in Spring Cloud.

• Client-side load balancing can be implemented by using technologies like Feign or RestTemplate in Spring Cloud.

• Using a load balancer like Nginx or Apache in f...read more
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Q2. Write SQL queries with conditional operator
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SQL queries with conditional operator
• Use CASE statement for conditional logic in SQL queries

• Syntax: SELECT column_name, CASE WHEN condition THEN value1 ELSE value2 END AS new_column_name FROM table_name

• Example: SELECT employee_name, CASE WHEN salary > 50000 THEN 'High' ELSE 'Low' END AS salary_category FROM employees
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