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Chapter 6: Problem 22

What two questions should you ask to determine a class's responsibilities?

Short Answer

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Answer: The two key questions to ask when determining a class's responsibilities are: 1. What is the purpose of the class? It is crucial to identify the class's specific purpose in the context of the overall program or system, as this helps maintain separation of concerns, leading to more maintainable and easily understandable code. 2. How does the class interact with other classes? Understanding the relationships between classes helps identify which data should be stored within the class and which actions it should be capable of performing. This also ensures the class follows the principle of encapsulation by only exposing necessary data and methods to other classes.

Step by step solution

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Question 1: What is the purpose of the class?

The first question to ask in determining a class's responsibilities is its purpose. It is important to identify what the class is meant to do or represent in the context of the overall program or system. A class should have a clear and specific purpose, as this helps to maintain a separation of concerns and makes the code more maintainable and easier to understand.
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Question 2: How does the class interact with other classes?

The second question to ask when determining a class's responsibilities is how it interacts with other classes. In object-oriented programming, classes often work together to accomplish a task or represent a larger system. By understanding the relationships between classes, it is possible to identify which data should be stored within the class, and which actions the class should be capable of performing. This will also help to ensure that the class follows the principle of encapsulation, by only exposing necessary data and methods to other classes.

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