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:

Gross Profit

The difference between sales revenue and the cost of goods sold, representing the basic profitability of a company's core business activities.

Inventory

The total amount of goods and materials held by a company, intended for sale or used in the production of goods to be sold.

Rising Prices

A period or condition where the general level of prices for goods and services is increasing, often measured by indices such as the Consumer Price Index (CPI).

FIFO

First-In, First-Out, an inventory valuation method where goods or materials purchased first are the first to be sold or used.