Questions and Answers
What is an association in UML?
What is an attribute in UML?
A holder for data representing the state of an instance of a class.
What does a class represent in UML?
A representation of a 'thing' in the system, showing its attributes and operations.
What is a class diagram?
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What is a default value in UML?
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What is a derived attribute?
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What does multiplicity indicate in UML?
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What is a note used for in a class diagram?
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What does the term 'operation' refer to in UML?
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What is the purpose of a package in UML?
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What is a parameter in UML?
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What does the private access modifier do?
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What is a protected member in UML?
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What does the public access modifier allow?
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What is the public interface of a class?
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What is a relationship pointer in UML?
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Study Notes
UML Class Diagrams Fundamentals
- Association: Line depicting the relationship between two classes with a name above it; arrows indicate directionality.
- Attribute: A variable holding data representing the state of a class instance, also known as a member variable.
- Class: Represents a "thing" in the system with its attributes and operations; serves as a blueprint for creating objects.
- Class Diagram: A static, structural diagram in UML that illustrates classes and their interrelationships.
- Default Value: A preset value for an attribute when no value is explicitly assigned; shown with an equal sign (=) followed by the value in a class diagram.
- Derived Attribute: Not stored but calculated from other attributes; indicated with a forward slash ("/") preceding the name and accompanied by a logic description.
- Multiplicity: Indicates the number of instances in a relationship or distinct values in an attribute; displayed near associations or in square brackets next to attribute names.
Additional Elements in Class Diagrams
- Note: Offers additional information about a class, shown in a rectangle connected to the relevant class with a solid line and featuring a clipped corner.
- Operation: Refers to the methods associated with a class in UML.
- Package: Groups related classes, equivalent to packages in Java and namespaces in .NET.
Member Access Modifiers
- Parameter: Placeholder for values passed to operations; defined by name, colon, and data type; multiple parameters are separated by commas.
- Private Access: Restricts access to the class members only within the same object; indicated by a dash ("-").
- Protected Access: Accessible to the object and child class instances; treated as private by other classes; denoted by a number sign ("#").
- Public Access: Allows any object to access the member; methods should typically be public, while attributes should generally remain private; indicated by a plus sign ("+").
- Public Interface: Comprises all public members, attributes, and operations of a class.
Relationship Indications
- Relationship Pointer: Arrow-like symbol representing the direction of relationships in association names, employing either the greater-than (">") or less-than ("<") symbols.
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Test your knowledge on UML class diagrams with these flashcards. Cover key concepts such as association, attributes, and their definitions. Perfect for students and professionals looking to reinforce their understanding of class diagram terminology.