Graphic Guide to R with Processing.R 4 (Graphic Guide to Programming) by Antony Lees

Author:Antony Lees
Language: eng
Format: epub
Publisher: Antony Lees
Published: 2024-06-17T00:00:00+00:00

Figure 99: partially completed hover_frog subclass

This is because we created a method called display() in hover_frog which tells hover_frog objects to use that display() method instead of the one in the superclass. This is known as overriding – as in ‘override the inherited method and use this one instead’.

As both classes now have different display() methods it will use the relevant one depending on which class our object came from (frog or hover_frog).

We have three options here:

Call the method something else. This has some inherent problems because display() is a good name for what the method does and renaming it means we have two methods, one inherited from Frog and the new one

Copy the code from frog to hover_frog so it also draws a frog. This would work but means we have completely ignored the benefits of inheriting the method and now we have two methods in different classes that do the same thing. This will be an issue if we need to change it because now we have two places to remember to change

Use the inherited method as well as the new method even though they have the same name

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