FAQ: Inheritance and Polymorphism - Parent Class Aspect Modifiers

This community-built FAQ covers the “Parent Class Aspect Modifiers” exercise from the lesson “Inheritance and Polymorphism”.

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FAQs on the exercise Parent Class Aspect Modifiers

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The automatic tutor doesn’t recognize “public final” but only “final public”. Both are valid.


Not only are both valid, public final is “more” correct by typical convention. See this post on Stack Overflow: https://stackoverflow.com/questions/10299067/modifier-keyword-order-in-java

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The description states that no modifier and private cannot keep a parent class member accessible to its child classes, only public and protected can. However, in the code, I did not put any modifier in front of the instance variables, but it worked fine. I could access the parent class and child class together. So is the description wrong?

Inside the chart of the properties of the modifiers it should be mentioned that the Child class column is also from another package. As so the no modifier(default) modifier gives access as long as the child class is a part of the same package. (package privacy if you will)


As far as my beginner knowledge goes, below is how I define class, child class, and public.
Please correct me if I wrong.
Class: the whole codes inside one text editor
Child class: other ClassName.java that ‘extends’ a class.
public: any other ClassName.java

Any other description or example to better know what a package means?