There is no fixed number of abstract methods required in an abstract class. An abstract class can have:
- Zero or more abstract methods (methods declared without a body, which must be implemented by subclasses).
- It can also have regular (concrete) methods with implementations.
In other words, an abstract class may contain no abstract methods at all but still be declared abstract to prevent instantiation and to require subclassing
. For example, in Java and C#, an abstract class can have any number of abstract methods, including none. If it has abstract methods, the subclass must implement all of them. But the presence of abstract methods is not mandatory to declare a class abstract
. Summary:
- Minimum abstract methods in an abstract class: 0
- Maximum abstract methods: unlimited, depending on design
This flexibility allows abstract classes to serve as partial templates for subclasses, enforcing implementation of some methods while providing others with default behavior
