Mastering Java: The Ultimate Quiz for 'Thinking in Java'

What design pattern is best exemplified by allowing multiple enum instances to perform operations against each other?

1. State Pattern

2. Observer Pattern

3. Strategy Pattern

4. Multiple Dispatch Pattern

The correct answer is: Multiple Dispatch Pattern

The Multiple Dispatch Pattern is the best design pattern to use in order to allow multiple enum instances to perform operations against each other. This pattern enables different versions of a method to be called based on the runtime type of all of its arguments, allowing for flexible and dynamic behavior. The other options listed, such as the State Pattern, Observer Pattern, and Strategy Pattern, do not offer the same level of flexibility and do not directly address the scenario described in the question. They may be useful in other situations, but are not the most suitable for this specific scenario.