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Inheritance Rules

AP CSA inheritance rules

TermDefinition
Rule 1 Superclass is the parent class. Subclass is the child class.
Rule 2 Subclass inherits methods and variables from the superclass. Constructors for the subclass must be rewritten.
Rule 3 Subclass methods behave the same as the superclass unless they are told otherwise.
Rule 4 The “super” keyword represents the class name of the superclass. It can be used to call the constructor or the methods of the superclass.
Rule 5 A constructor has to be created in the subclass. If the subclass doesn’t use super, it implicitly calls the superclass’ default constructor (no arguments).
Rule 6 All classes have the .equals() and .toString() method because they inherit it from the object class that is the superclass for all other classes.
A super class can be implemented as a subclass. It behaves like the subclass (polymorphism). A subclass can not be implemented as a superclass. General to more specific. NOT specific to the general.
Rule 8 An error will be thrown if the superclass is created as a subclass and a method that only exists in the subclass is called on the object.
Created by: eazymoneysniper
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