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Top 50 object-oriented programming Interview Questions

The most frequently asked object-oriented programming questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~8htotal time
74companies covered
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1
CodingStart here. 35 questions · ~338 min
Card Game War ImplementationHard
Practice

Simulate the War card game using queues, including multi-card battles and deck exhaustion.

object-oriented programmingWorkiva
Sparse Vector in PythonMedium
Practice

Implement a dictionary-backed sparse vector with efficient updates, lookups, and dot products.

object-oriented programmingRed Hat
Create Object With Getters SettersEasy
Practice

Implement a validated configuration object with private attributes, setters, getters, and ordered updates.

javaobject-oriented programmingCgi Nederland
Core Java Concepts: InterfacesEasy
Recently asked

Tests your understanding of interfaces and basic OOP concepts relevant to building Zappos Family software.

javaobject-oriented programmingJ.D. PowerSSilicon InterfacesWhole Foods Market
Core Java PrinciplesMedium
Recently asked

Assesses knowledge of OOP fundamentals used in Java-style design.

object-oriented programmingBoston ScientificAmentumIT Partner España
Encapsulation in PracticeEasy

Tests your understanding of encapsulation and how it supports maintainable software design.

javaobject-oriented programmingLogicMonitorGenpactAApplied Research Associates
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2
Technical Fundamentals5 questions · ~48 min
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3
System Design3 questions · ~29 min
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4
More topics7 questions · ~68 min
Explaining OOP Tradeoffs to TeammatesMedium
Recently asked

Tests technical communication and leadership through a concrete example of explaining OOP design tradeoffs and driving alignment.

experienceobject-oriented programmingprogramming conceptsPwCLuxoft IndiaDeloitte
OOP in Data PipelinesHard
Recently asked

Explain how object-oriented design improves reusable, testable, and maintainable Python or C++ data pipelines.

Data Qualitydata pipelinedata pipelinesJPMorganChase
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
SQL Data Quality ChecksHard
Practice
Practice drill

Detect missing fields, duplicate transaction keys, invalid amounts, and merchant reference issues with PostgreSQL CTEs and joins.

Data Qualitynull handlingdata integritySigmoidCox Automotive
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