How is abstraction achieved in Java?

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Abstraction in Java is effectively achieved by using both abstract classes and interfaces. Each mechanism provides a way to define methods that can be implemented by subclasses or implementing classes, allowing developers to focus on the essential characteristics of an object while hiding unnecessary implementation details.

Abstract classes serve as a blueprint for other classes. They can have defined methods as well as abstract methods (methods without a body), which must be implemented by any concrete subclass. This allows a common base to be established, ensuring that derived classes follow a certain contract while maintaining some shared functionality.

On the other hand, interfaces solely define a contract for what methods a class must implement, without dictating how these methods should be implemented. This allows for a different kind of abstraction, where a class can implement multiple interfaces, offering flexibility in design and allowing multiple inheritance of type.

Using both abstract classes and interfaces provides a robust framework for abstraction in Java. It allows developers to create reusable and maintainable code by clearly defining how different components interact without exposing their internal workings. Thus, combining both mechanisms enhances the level of abstraction that can be achieved, making option C the most comprehensive choice.