When to Use Abstract Classes

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Here, Shape contains variables for each shape's x and y coordinates, and abstract methods for calculating area and perimeter. Because they are abstract, each concrete subclass can implement them differently.

For example, we can create a subclass Circle that extends the base class and chinese overseas british database implements its own versions of the getArea() and getPerimeter() methods:

Abstract methods and abstract classes are often used together to provide a common interface for a group of related classes.

Let's continue to explore this with our shape game and see how we can use abstract methods to define a common interface that calculates the perimeter and area of ​​shapes. So, we already have an abstract class Shape that contains abstract methods to define the shape parameters we need: