Differences between abstract and concrete classes

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It is impossible to create instances of the former (it is possible for concrete classes). Extending other classes, implementing abstract methods and subsequent inheritance is the main purpose of abstract classes.

Differences between abstract and concrete classes
Differences between abstract and concrete classes
Also, concrete models do not have constructors, but abstract ones can chinese overseas british databasehave them - provided that they are called from subclasses directly. Moreover, the constructor of the latter must call the constructor of the corresponding superclass.


For example, if you need to create and define a common interface and behavior that will be used by several classes at the same time. Let's look at a specific example. Let's say you are creating a game that involves various geometric shapes: circles, squares, triangles. They all have both common parameters (perimeter and area) and unique ones (radius, diagonal lengths, number of sides). To represent these shapes in the game, you can use the abstract Shape class, which defines behavior common to all shapes. It will look like this: