BNP Paribas Interview Questions and Answers

The area of a room can be calculated by multiplying the length by the width.

• Calculate the area by multiplying the length and width of the room.

• For example, if the length of the room is 10 feet and the width is 12 feet, the area would be 120 square feet.

• Make sure to use the same units for length and width when calculating the area.

Getting caught cheating on a test in high school

• Was copying answers from a classmate during a test

• Teacher caught me and called me out in front of the whole class

• Felt embarrassed and learned my lesson about cheating

JSP, Servlets, Applets, WebSphere, and Java 7 features are key components of Java web development and enterprise applications.

• JSP (JavaServer Pages) allows embedding Java code in HTML for dynamic web content generation.

• Servlets are Java programs that run on a server, handling requests and responses in web applications.

• Applets are small Java programs that run in a web browser, though largely obsolete now.

• IBM WebSphere i...read more

Swing is a GUI toolkit for Java; Linux commands are used in the OS; Java features like generics were introduced before Java 8.

• Swing: A part of Java Foundation Classes (JFC) for building graphical user interfaces.

• Example of Swing: JFrame, JButton, and JPanel are commonly used components.

• Linux Command: Commands like 'ls', 'cd', and 'mkdir' are used for file management.

• Example of a Linux command: 'ls -l' lists files in lo...read more

Use two threads to print odd and even numbers in sync

• Create two threads, one for printing odd numbers and one for printing even numbers

• Use synchronization mechanisms like mutex or semaphore to ensure output is in sync

• Example: Thread 1 prints odd numbers (1, 3, 5, ...) and Thread 2 prints even numbers (2, 4, 6, ...)

Find the largest common prefix among an array of strings.

• Iterate through the characters of the first string and compare with the corresponding characters of other strings.

• Stop when a mismatch is found or when reaching the end of any string.

• Return the prefix found so far.

Saga pattern is a design pattern used in microservices architecture to manage distributed transactions.

• Saga pattern breaks down a transaction into a series of smaller, independent steps.

• Each step in the saga is a separate transaction that can be rolled back if needed.

• If one step fails, compensating transactions can be executed to undo the changes made by previous steps.

• Saga pattern helps maintain data consistency in a ...read more

Hash map and hash set are data structures that use hashing to store key-value pairs and unique values respectively.

• Hash map uses key-value pairs where keys are hashed to find the corresponding value

• Hash set stores unique values using hashing to quickly check for duplicates

• Example: HashMap<String, Integer> map = new HashMap<>(); HashSet<Integer> set = new HashSet<>();

Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Singleton pattern involves a private constructor, a static method to access the instance, and a static variable to hold the instance.

• To break the singleton pattern, one can use reflection to access the private constructor and create multiple instances.

• Another way to break the singleton pattern is by using serialization a...read more