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Questions and Answers
What is a class?
What is a class?
A class is a description of a set of objects that share the same attributes, operations, relationships, and semantics.
What is a simple name in the context of a class?
What is a simple name in the context of a class?
A name that distinguishes a class from other classes.
What is an attribute in relation to a class?
What is an attribute in relation to a class?
A named property of a class that describes a range of values that instances may hold.
What is the purpose of an operation in a class?
What is the purpose of an operation in a class?
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Which of the following represents a responsibility of a class?
Which of the following represents a responsibility of a class?
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What does it mean to elide a class?
What does it mean to elide a class?
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What is the significance of a qualified name?
What is the significance of a qualified name?
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A class can have no attributes or operations at all.
A class can have no attributes or operations at all.
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A __________ is a named property of a class that describes a range of values.
A __________ is a named property of a class that describes a range of values.
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Match the following types with their correct definitions:
Match the following types with their correct definitions:
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Study Notes
Basic Structural Modeling
Classes
- A class is a set of objects sharing attributes, operations, relationships, and semantics.
- Graphical representation of a class is a rectangle.
- Each class has a name, which is either a simple name (just the class name) or a qualified name (class name plus package name).
Attributes
- Attributes represent properties of a class, defining possible values instances can hold.
- A class can have many or few attributes; attributes describe shared characteristics (e.g., height, width for a Wall class).
Operations
- Operations are services that can be invoked on class objects, representing behaviors that affect object state.
- Example operations in a Rectangle class include moving, resizing, or querying its properties.
- Operations are depicted below attributes graphically and include signatures (name, type, default values, return type).
Organizing Attributes and Operations
- Not every attribute and operation needs to be depicted in a class diagram; only relevant ones should be displayed.
- Use ellipses ("...") to indicate more attributes or operations exist than shown.
Responsibilities
- Each class has responsibilities representing its obligations toward maintaining state and behavior.
- Examples: Wall class manages dimensions; FraudAgent class processes and evaluates orders; TemperatureSensor class monitors temperature levels and triggers alarms.
Common Modeling Techniques
Modeling System Vocabulary
- Classes are used to model abstractions relevant to solving a specific problem or therapeutic solution.
- Identify key terms critical to users or implementers through methods like CRC cards and use case analysis.
- Ensure each class has clearly defined roles and responsibilities.
- Example classes could include Customer, Order, Product, Shipment, Invoice, and Transaction.
Distribution of Responsibilities
- As the number of classes increases, it's vital to ensure responsibilities are balanced among them, allowing for manageable and logical structuring of the system's vocabulary.
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Description
Explore the fundamental concepts of basic structural modeling in this quiz. Topics include classes, relationships, common mechanisms, and diagrams. Test your understanding of these key elements and their significance in system design.
