UML Class Diagram Flashcards
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Questions and Answers

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?

A template for creating objects of a certain type, useful for grouping related features or data.

What does Association refer to in UML?

A relationship between two (or more) classes.

What is Aggregation in UML?

<p>A stronger relationship than Association that represents a 'has a' type relationship.</p> Signup and view all the answers

What does Composition mean in UML?

<p>A relationship in which X 'owns a' Y, implying that Y cannot exist on its own as it is part of X.</p> Signup and view all the answers

How do we represent an Association type relationship in a Class Diagram?

<p>A solid line connecting the two classes.</p> Signup and view all the answers

How do we represent an Aggregation type relationship in a Class Diagram?

<p>A solid line connecting the two classes with an unfilled diamond at one end.</p> Signup and view all the answers

How do we represent a Composition type relationship in a Class Diagram?

<p>A solid line connecting the two classes with a filled diamond at one end.</p> Signup and view all the answers

How do we represent an Inheritance type relationship in a Class Diagram?

<p>A solid line connecting the two classes with an unfilled triangle at one end.</p> Signup and view all the answers

How would I represent that Class A realizes the Interface B?

<p>Class A -----------|&gt; Interface B</p> Signup and view all the answers

How would I represent a multiplicity of 2 to many?

<p>2..*</p> Signup and view all the answers

How would I show that a class has a private attribute called name that is a String type?

<ul> <li>name: String</li> </ul> Signup and view all the answers

How would I show that a class has a public attribute called address that is an Address type?

<ul> <li>address: Address</li> </ul> Signup and view all the answers

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?

<ul> <li>complexCalculation(alpha: double, gamma: integer): double</li> </ul> Signup and view all the answers

How would I convert the following attribute into Java code: - favouriteNumber : int

<p>private int favouriteNumber;</p> Signup and view all the answers

How would I convert the following attribute into Java code: - ownedCats : List

<p>private List ownedCats;</p> Signup and view all the answers

How would I convert the following method into Java code: + complexCalculation(alpha: double, gamma: int): double

<p>public double complexCalculation(double alpha, int gamma) { //Implementation goes here }</p> Signup and view all the answers

How would I convert the following Class into Java code: Animal with a private String attribute called name and a public method makeSound?

<p>public class Animal { private String name; public void makeSound(); }</p> Signup and view all the answers

How do I show that a class is an Abstract class or that a method is an Abstract method in a Class diagram?

<p>You make the class name or method name italic.</p> Signup and view all the answers

How would I convert the following Class into Java code: Animal with a private String attribute called name?

<p>public abstract class Animal { private String name; }</p> Signup and view all the answers

How would I convert the following into Java code: Flyable with a public method fly()?

<p>public interface Flyable { public void fly(); }</p> Signup and view all the answers

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: String translates to private String name;.
  • Public attribute example: + address: Address translates to + address: Address;.

Method Representation

  • Public method example: + complexCalculation(alpha: double, gamma: integer): double translates to public 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 Animal with attribute - name: String and method + makeSound():
      • public class Animal { private String name; public void makeSound(); }

Abstract Classes and Methods

  • Abstract classes or methods are indicated by italicized names or labels stating "abstract".
  • Example: Abstract class Animal representation translates into Java.

Flyable Interface

  • Represented with just the interface name and method declaration, e.g., + fly().

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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.

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