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What is a UML Class Diagram?
What is a UML Class Diagram?
A structural UML diagram that represents the structure of an Object-Oriented System by showing the Classes and Relationships between them.
What is a Class in Object-Oriented Programming?
What is a Class in Object-Oriented Programming?
A template for creating objects of a certain type, useful for grouping related features or data.
What does Association refer to in UML?
What does Association refer to in UML?
A relationship between two (or more) classes.
What is Aggregation in UML?
What is Aggregation in UML?
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What does Composition mean in UML?
What does Composition mean in UML?
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How do we represent an Association type relationship in a Class Diagram?
How do we represent an Association type relationship in a Class Diagram?
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How do we represent an Aggregation type relationship in a Class Diagram?
How do we represent an Aggregation type relationship in a Class Diagram?
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How do we represent a Composition type relationship in a Class Diagram?
How do we represent a Composition type relationship in a Class Diagram?
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How do we represent an Inheritance type relationship in a Class Diagram?
How do we represent an Inheritance type relationship in a Class Diagram?
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How would I represent that Class A realizes the Interface B?
How would I represent that Class A realizes the Interface B?
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How would I represent a multiplicity of 2 to many?
How would I represent a multiplicity of 2 to many?
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How would I show that a class has a private attribute called name that is a String type?
How would I show that a class has a private attribute called name that is a String type?
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How would I show that a class has a public attribute called address that is an Address type?
How would I show that a class has a public attribute called address that is an Address type?
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How would I show that a class has a public method called complexCalculation that returns a double and takes two parameters; a double called alpha and an integer called gamma?
How would I show that a class has a public method called complexCalculation that returns a double and takes two parameters; a double called alpha and an integer called gamma?
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How would I convert the following attribute into Java code: - favouriteNumber : int
How would I convert the following attribute into Java code: - favouriteNumber : int
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How would I convert the following attribute into Java code: - ownedCats : List
How would I convert the following attribute into Java code: - ownedCats : List
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How would I convert the following method into Java code: + complexCalculation(alpha: double, gamma: int): double
How would I convert the following method into Java code: + complexCalculation(alpha: double, gamma: int): double
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How would I convert the following Class into Java code: Animal with a private String attribute called name and a public method makeSound?
How would I convert the following Class into Java code: Animal with a private String attribute called name and a public method makeSound?
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How do I show that a class is an Abstract class or that a method is an Abstract method in a Class diagram?
How do I show that a class is an Abstract class or that a method is an Abstract method in a Class diagram?
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How would I convert the following Class into Java code: Animal with a private String attribute called name?
How would I convert the following Class into Java code: Animal with a private String attribute called name?
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How would I convert the following into Java code: Flyable with a public method fly()?
How would I convert the following into Java code: Flyable with a public method fly()?
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Study Notes
UML Class Diagram
- Represents the structure of an Object-Oriented System, showcasing Classes and their Relationships.
Class
- Serves as a template for creating objects of a specific type.
- Groups related features or data together.
Association
- Indicates a relationship between two or more classes.
Aggregation
- Represents a 'has a' relationship, stronger than Association.
- Example: A Person has an Address, which can exist independently.
Composition
- Represents an ownership relationship, where X 'owns a' Y.
- Implies that Y cannot exist independently as it is part of X.
Relationship Representation in Class Diagrams
- Association: Shown with a solid line connecting classes.
- Aggregation: Depicted with a solid line and an unfilled diamond at one end, next to the aggregating class.
- Composition: Illustrated with a solid line and a filled diamond at one end, indicating ownership.
- Inheritance: Shown with a solid line and an unfilled triangle at one end, adjacent to the superclass.
- Realization of an Interface: Represented with a dashed line connecting the class to the interface.
Multiplicity
- Indicated as "2..*" to represent a cardinality of 2 to many.
Attributes Representation
- Private attribute example:
- name: Stringtranslates toprivate String name;. - Public attribute example:
+ address: Addresstranslates to+ address: Address;.
Method Representation
- Public method example:
+ complexCalculation(alpha: double, gamma: integer): doubletranslates topublic double complexCalculation(double alpha, int gamma) { /* Implementation */ }.
Conversion to Java Code
- Attributes and methods convert into Java code format based on visibility (private/public) and data types.
- Example for class conversion:
- Class
Animalwith attribute- name: Stringand method+ makeSound():-
public class Animal { private String name; public void makeSound(); }
-
- Class
Abstract Classes and Methods
- Abstract classes or methods are indicated by italicized names or labels stating "abstract".
- Example: Abstract class
Animalrepresentation translates into Java.
Flyable Interface
- Represented with just the interface name and method declaration, e.g.,
+ fly().
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Description
Test your knowledge of UML class diagrams with these flashcards. Each card includes key terms and definitions that are essential for understanding object-oriented system design. Perfect for visualizing classes and their relationships in software development.
