You Wish to Implement a Callback Method for an Object

question 51

Multiple Choice

You wish to implement a callback method for an object created from a library class that you cannot change.What is the preferred way to accomplish this?

• A)Extend the library class.
• B)Use an inner class in the interface.
• C)Create a new class that mimics the library class.
• D)Use a helper class that implements the callback method.

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Definitions:

Market-Determined Quantity

Refers to the quantity of a good or service that is established through the interaction of supply and demand within a market.

Marginal Social Benefit

The additional benefit that society gains from the production or consumption of one more unit of a good or service.

Marginal Social Cost

The total cost to society of producing one additional unit of a good or service, considering both private costs and externalities.

Coal Mine Pollution

Environmental damage caused by the extraction and processing of coal, including air and water pollution.