Question

In an interaction diagram, messages are sent and received by individual objects, not by classes. True or False?

1) True
2) False

Answer 1

In an interaction diagram, it is true that messages are exchanged between objects, not classes. The amplitude of one wave can be affected by another even when not perfectly aligned; this statement is false. Also, it is true that the two types of interference in wave interactions are constructive and destructive.

Step-by-step explanation:

Interaction Diagram and Wave Interference

The statement that messages are sent and received by individual objects, not by classes, in an interaction diagram is true. Interaction diagrams are used in object-oriented programming and design to represent the dynamic behavior between objects, focusing on the messages that objects send to one another during execution. The classes themselves do not send messages; rather, it is the specific instances of these classes, known as objects, that communicate directly.

Regarding wave interaction, the statement that the amplitude of one wave is affected by the amplitude of another wave only when they are precisely aligned is false. Waves can interfere with each other under various conditions of alignment, not solely when they are perfectly aligned. When two waves meet, they can interfere either constructively, where their amplitudes add together, or destructively, where their amplitudes subtract from each other, depending on the phase relationship between the waves at the point of interaction.

It is true that the two types of interference are constructive and destructive interferences. Constructive interference occurs when two waves are in phase and their amplitudes add together, resulting in a wave of greater amplitude. In contrast, destructive interference happens when two waves are out of phase, and the amplitude of one wave reduces the amplitude of the other, sometimes even canceling it out completely.

Answer 2

False. In an interaction diagram, messages are sent and received by individual objects, not by classes.

Step-by-step explanation:

Interaction diagrams, such as sequence diagrams and communication diagrams in Unified Modeling Language (UML), depict the dynamic aspects of a system, illustrating how objects collaborate to achieve a certain behavior. In these diagrams, messages are indeed sent and received by individual objects, representing instances of classes. Objects, instantiated from classes, interact by exchanging messages to perform specific actions or communicate information.

The distinction between classes and objects is crucial in understanding the granularity of interactions within a system. While classes define the blueprint or template, objects are instances of these classes, and it is these objects that engage in communication through message passing in interaction diagrams.