PureSoftware Interview Questions and Answers

HashMap is not thread-safe while ConcurrentHashMap is thread-safe.

• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified during iteration.

• ConcurrentHashMap allows concurrent read and write operations without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurren...read more

To find the third highest salary in a SQL table, use the 'SELECT DISTINCT' statement with 'ORDER BY' and 'LIMIT'.

• Use 'SELECT DISTINCT' to avoid duplicates

• Order the salaries in descending order using 'ORDER BY'

• Use 'LIMIT 2,1' to skip the first two highest salaries and retrieve the third highest salary

Design a parking lot system that efficiently manages parking spaces and vehicle tracking.

• Define parking lot structure: multiple levels, sections, and types of spaces (compact, standard, handicapped).

• Implement entry and exit points with ticketing or automated systems for tracking vehicles.

• Use sensors or cameras to monitor available spaces in real-time.

• Incorporate a mobile app for users to find available spots and reserv...read more

Python program to find smallest integer greater than square root of a given number.

• Use math module to calculate square root of the given number.

• Use math.ceil() function to round up the square root to the nearest integer.

• Add 1 to the rounded up square root to get the smallest integer greater than square root.

SQL query to list employees with third highest salary

• Use the 'ROW_NUMBER()' function to assign a rank to each employee based on salary

• Filter the results to only include employees with a rank of 3

Stemming and lemmatization are techniques used in natural language processing to reduce words to their base or root form.

• Stemming is the process of reducing words to their base or root form by removing suffixes.

• Example: 'running' becomes 'run' after stemming.

• Lemmatization is the process of reducing words to their base or root form while still ensuring that the reduced form belongs to the language.

• Example: 'better' beco...read more

I worked on various projects using technologies like Java, React, and AWS, focusing on scalable web applications and microservices.

• Developed a web application using React and Node.js for a retail client, improving user engagement by 30%.

• Implemented a microservices architecture with Spring Boot and Docker for a healthcare platform, enhancing scalability.

• Utilized AWS services like S3 and Lambda for a media processing app...read more

Fintech integrates technology with financial services, enhancing efficiency, accessibility, and user experience in finance.

• Digital Payments: Platforms like PayPal and Venmo enable quick and secure transactions.

• Blockchain Technology: Cryptocurrencies like Bitcoin utilize blockchain for secure, decentralized transactions.

• Robo-Advisors: Services like Betterment and Wealthfront use algorithms to provide automated investmen...read more

String operations in Tosca Automation involve manipulating and validating strings in test scripts.

• Use functions like 'contains', 'startsWith', 'endsWith' for string validation

• Use 'concatenate' function to combine multiple strings

• Use 'substring' function to extract a portion of a string

Join tables to retrieve the highest salary of employees using SQL queries.

• Use SQL JOIN to combine employee and salary tables.

• Utilize the MAX() function to find the highest salary.

• Example query: SELECT MAX(salary) FROM employees JOIN salaries ON employees.id = salaries.employee_id;

• Consider GROUP BY if you need the highest salary per department.

Swift & Objective-C are programming languages used for iOS development. Tableview in SwiftUI uses List view. RxSwift is a reactive programming framework. Optional & Generics are Swift features. Protocol Composition is combining multiple protocols.

• Swift & Objective-C are used for iOS development

• Tableview in SwiftUI uses List view

• RxSwift is a reactive programming framework for Swift

• Optional allows variables to have a 'no...read more