Concrete Factories (Windows & Mac):?

• The WindowsUIFactory and MacUIFactory are concrete implementations

of the IUIFactory interface. Each factory creates platform-specific objects

like buttons and checkboxes.

public class WindowsUIFactory : IUIFactory
{
public IButton CreateButton() => new WindowsButton();
public ICheckbox CreateCheckbox() => new WindowsCheckbox();
}
public class MacUIFactory : IUIFactory
{
public IButton CreateButton() => new MacButton();
public ICheckbox CreateCheckbox() => new MacCheckbox();
}