What must a class contain if it has an abstract method?

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A class that contains an abstract method must indeed be defined as an abstract class. This requirement is part of the object-oriented programming paradigm, particularly in languages such as Java and C#. An abstract method is a method that is declared without an implementation, meaning that it does not provide any code to define what the method does.

Since abstract methods do not have implementations, the class that contains them cannot be instantiated directly. Instead, it serves as a blueprint for other classes that extend this abstract class. These derived classes are responsible for providing concrete implementations of the abstract methods declared in the abstract class. This design enforces a level of abstraction and allows for polymorphism in the code.

In this context, a constructor is not necessary for a class to be abstract. While abstract classes can have constructors and these constructors can be used by subclasses, the presence of a constructor is not a requirement for a class to be abstract.

A concrete implementation of the method is not present in the abstract class, as that contradicts the purpose of declaring the method as abstract. The expectation is that subclasses will implement the abstract method.

Lastly, while an abstract class can implement other abstract methods from superclasses, this is not a requirement for all abstract classes. A subclass may or may