You Wish to Implement a Callback Method for an Object

question 23

Multiple Choice

You wish to implement a callback method for an object created from a system class that you cannot change. What approach does the textbook recommend to accomplish this?

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

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Definitions:

Aggregate Supply Curve

A graph that shows the relationship between the overall price level in the economy and the total output (GDP) that firms produce and sell, at all possible price levels.

Trade Restrictions

Measures imposed by governments to regulate international trade, including tariffs, quotas, and embargoes.

Natural Resources

The inputs into the production of goods and services that are provided by nature, such as land, rivers, and mineral deposits.

Aggregate Demand

The total demand for all finished goods and services produced in an economy at a given time and price level.