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:

Force Majeure Clause

A contractual provision that frees all parties from liability or obligation when an extraordinary event or circumstance beyond their control occurs, preventing them from fulfilling their obligations.

Declaration Of War

A formal statement issued by a national government indicating that a state of war exists between it and another nation.

United Nations

An international organization formed in 1945 to promote peace, security, and cooperation among the world's nations through diplomacy and dialogue.

Performance Impossible

A legal concept where the fulfillment of contractual obligations becomes impossible due to unforeseeable circumstances.