Are these Inheritance, Interfaces and Polymorphism notes free?

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What does the Inheritance, Interfaces and Polymorphism revision sheet cover?

Inheritance is an is-a relationship, The forms Java allows, and the one it does not, Single, Multilevel, Hierarchical, Multiple, NOT allowed, Multilevel inheritance, and how far a member travels, Vehicle, Car, SportsCar, method overriding, dynamic binding.

Is this for Class 12 ISC Computer Science?

Yes, it is written for the ISC Computer Science syllabus.

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Inheritance, Interfaces and Polymorphism — Class 12 ISC Computer Science revision notes

A 4-page visual revision sheet for Inheritance, Interfaces and Polymorphism, written for Class 12 ISC Computer Science. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

Inheritance, Interfaces and Polymorphism revision notes, page 1 of 4 — A preview of page 1 — all 4 pages open full size in the app.

Inheritance, Interfaces and Polymorphism in one look

reusing a class without copying it, and letting one call mean different things

Inheritance is an is-a relationship

a subclass extends a superclass, taking its fields and methods without copying any code, and adding or changing what it needs
the test is the sentence: a Circle is a Shape, so Circle extends Shape; a Car has an Engine, which is composition and not inheritance
super reaches the parent: super() calls the parent constructor and must be the first statement, and super.method() calls the parent's version
a subclass constructor always runs its parent's constructor first, whether or not super() is written, so the chain builds from the top down

The forms Java allows, and the one it does not

Single: one subclass extends one superclass, the ordinary case
Multilevel: a subclass is itself extended, so the chain is three deep or more
Hierarchical: several subclasses extend the same superclass
Multiple, NOT allowed: a Java class cannot extend two classes, because a clash between two inherited versions would have no resolution; interfaces are the way round it

Multilevel inheritance, and how far a member travels

Vehicle
Car
SportsCar

Page 1 of 4. The full sheet, all 4 pages, opens free in the app.

What this Inheritance, Interfaces and Polymorphism sheet covers

Inheritance is an is-a relationship
The forms Java allows, and the one it does not
Single
Multilevel
Hierarchical
Multiple, NOT allowed
Multilevel inheritance, and how far a member travels
Vehicle
Car
SportsCar
method overriding
dynamic binding
Overloading against overriding
Overloading
Overriding
Polymorphism, the two kinds
Abstract classes
Interfaces
Abstract class against interface
Abstract class
Interface
Words the question will use
Why Java refuses multiple class inheritance
Traps that cost marks
Tricks that save time

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