When messages are passed from one class to another, the receiving class must have a method corresponding to the message name.

Name: When messages are passed from one class to another, the receiving class must have a method corresponding to the message name.
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This is the basic principle of object-oriented programming, known as message passing or method dispatching. The receiver object must have a method with the same name as the message being sent, in order to properly handle the request.

When Messages Are Passed from One Class to Another, the Receiving