Home Learn step by step Memorise Key terms Flashcards Notes Master answers Past questions Multiple choice Mock exam Practice & marker

Software Engineering › Key terms › Y11 OOP › Inheritance

Inheritance

Term Key terms bank Y11 OOP

Definition

A subclass (child) automatically gets the attributes and methods of a superclass (parent) and can add or change its own, giving code reuse. It models an 'is-a' relationship.

Example: Student inherits name and age from Person; the arrow points from Student to Person.

Found in: syllabus, course specifications, 2025 HSC marking guidelines, sample exam and familiarisation guidelines, school notes, past SDD papers.

Short version to memorise (key terms bank)

Subclass reuses and extends a superclass.

Where it is used in the test

Syllabus area: Y11 OOP.

Question types it can appear in

Drawing: inheritance arrow on a class diagram
Python: class Child(Parent)
Multiple choice: Pick the option that matches the definition or example.
Short answer: Define, outline or explain it and tie it to the scenario.

Where it has appeared in the paper

The Software Engineering Project (Part A, B). Part letters follow each paper’s own layout.

Study links

Flashcard: Inheritance in The Object-Oriented Paradigm (Year 11) · study that set
Memorise: Object-oriented concepts
Key terms bank entry: Inheritance
Notes: Inheritance (Year 11 content (Programming fundamentals, OOP, Mechatronics))
Notes: Python OOP: classes, inheritance, polymorphism, encapsulation (Python and SQL you must be able to write)
Notes: Programming paradigms (Year 11 content (Programming fundamentals, OOP, Mechatronics))
Notes: Compare procedural programming with OOP. (Year 11 content (Programming fundamentals, OOP, Mechatronics))

How to use it in an answer

A model sentence

General advice, built from the definition and example above

“A subclass (child) automatically gets the attributes and methods of a superclass (parent) and can add or change its own, giving code reuse.” Then apply it: Student inherits name and age from Person; the arrow points from Student to Person.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

General advice

No linked question shows the command word for this term. Across the past drawing and python and short answer questions in this bank the words used most are: Explain, Outline, Describe, Compare, Classify, Analyse. Check the actual word in your question.

Technique for the question types

Drawing: Use the online drawing tool: label every symbol and arrow, use the correct symbols from the specification, and add every required item.
Python: Write code that runs: indentation, quotes, define functions before calling them, print the required output, meet every listed requirement.
Multiple choice: Read all four options, rule out wrong ones, pick one; no penalty for guessing so never leave blank.
Short answer: One clear point per mark, use the stimulus and course terms, and answer the command word.

What the marking guidelines and feedback say

2025 HSC Q22 (3 marks): Modelling tools

Technique: move attributes shared by several classes up into a parent (superclass) and draw an inheritance arrow from each subclass to the parent; leave only unique attributes in subclasses. Marker feedback: refine attributes into separate inherited classes; use appropriate class diagram symbols.

Sample exam Q24 (4 marks): Modelling tools (class diagram)

A reasoned design (NOT the NESA diagram): classes Trip(tripID; assignTicket()), PassengerCar(carModelCode), Engine(engineModelCode), Area(areaType, numSeats) with subclasses Executive (20 seats) and Standard (400 seats), Passenger(email, phone; buyTicket()) with subclass FrequentTraveller(loyalty info), Ticket(ticketType, seatNumber). Relationships: Trip 1 to many PassengerCar; Trip 1 to 1 Engine; Trip 1 to 2 Area; Passenger 1 to 0..* Ticket; Ticket * to 1 Trip. Show multiplicities and inheritance arrows (hollow triangle).

Common mistakes

Marker feedback on other questions of the same type (code and diagram feedback often applies across questions)

Drawing questions (2025 HSC exam Q22): refine attributes into separate inherited classes; use appropriate class diagram symbols.
Python questions (2025 HSC exam Q19): process string inputs; use a selection structure; code must execute in the environment; use correct indentation; call functions in the main program after defining them.
Python questions (2025 HSC exam Q26): replicate the grid; use the random library; use selection and looping to access the list; include a method of checking the number of values; use meaningful variable names and constants; avoid overly complex structures such as nested IF loops.