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Object-Oriented Programming (Java) Q&A (75 Questions) | UML, Design Patterns, OOP Principles | Software Engineering

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This document features 75 exam-style questions and verified answers focused on Object-Oriented Programming (OOP) using Java, curated for the 2025/2026 academic year. It serves as a high-quality academic resource for students preparing for OOP-related exams, certifications, or interviews in both theoretical and practical contexts. The content covers the fundamental OOP pillars: Encapsulation, Inheritance, and Polymorphism, while also diving deeper into critical principles like cohesion vs coupling, roles and responsibilities, and object relationships such as is-a, has-a, and uses-a. It explores advanced topics like upcasting and downcasting, static members, and the Liskov Substitution Principle. In addition, the document includes a strong focus on UML (Unified Modeling Language), detailing diagrams such as: Use Case Diagrams (actors, extends, includes) Class Diagrams (aggregation, composition, dependency, multiplicity) Sequence Diagrams (object interaction and message flow) Students will also benefit from concise definitions and usage explanations of key design patterns, such as: Singleton Pattern Iterator Pattern Adapter Pattern Facade Pattern Moreover, the material touches on Object-Oriented Analysis (OOA) and Object-Oriented Design (OOD) processes, software design principles, Agile methodology, and best practices like the Law of Demeter. This document is highly valuable for: Students of Software Engineering, Computer Science, Information Technology, and Systems Analysis Candidates preparing for Java OOP exams or object modeling interviews Instructors and tutors seeking clear, structured review content Developers seeking a concise reference for UML and OOP best practices Keywords: Object-Oriented Programming, Java, encapsulation, inheritance, polymorphism, UML diagrams, use case diagram, class diagram, sequence diagram, aggregation, composition, design patterns, singleton pattern, iterator pattern, adapter pattern, facade pattern, static members, Liskov principle, object-oriented design, object-oriented analysis, cohesion, coupling, software components, Java interfaces, upcasting, downcasting, agile software development

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Object-Oriented Programming [Java]
2025/2026 Exam Questions and Verified
Answers | Already Graded A+



Three Fundamental Features of OOP - 🧠ANSWER ✔✔Encapsulation


Inheritance

Polymorphism


Encapsulation - 🧠ANSWER ✔✔An object-oriented technique in which the

internal details of an object are "hidden" in order to simplify their use and

reuse.


Inheritance - 🧠ANSWER ✔✔A relationship between two classes in which

one class ( the subclass) inherits all of the properties and capabilities of

another ( the superclass)

, Polymorphism - 🧠ANSWER ✔✔Declaring a variable to have one type while

it refers to an object of a subclass of that type.


Object-Oriented Analysis - 🧠ANSWER ✔✔A means of determining what

aspects of a given problem can be viewed as objects in an eventual object-

oriented design.


Object-Oriented Design - 🧠ANSWER ✔✔A software design method that

models the characteristics of abstract or real objects using classes and

objects.


Object-Oriented Programming - 🧠ANSWER ✔✔A programming technique

that features objects, classes, encapsulation, interfaces, polymorphism,

and inheritance.


Cohesion - 🧠ANSWER ✔✔Degree to which responsibilities of a given

component are a meaningful unit


Cohesion vs Coupling - 🧠ANSWER ✔✔Greater cohesion reflects better

design. Less coupling reflects better design.


Coupling - 🧠ANSWER ✔✔Degree to which one component must directly

access the data of another component.

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