Classes & Interfaces

Classes are the fundamental building blocks of class diagrams. They represent objects in your system with their attributes (fields) and methods (operations).

Basic Classes

Define a class using the class keyword followed by the class name. You can include attributes and methods inside curly braces.

Class Diagram Example
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Basic Classes Example

Attributes and Methods

You can define attributes and methods using two syntax styles: simple declarations or with type annotations using colons.

Class Diagram Example
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Attributes and Methods Example

Visibility Modifiers

Control access to class members using visibility modifiers. Place the modifier symbol before the member name.

  • -
    Private - Only accessible within the class
  • #
    Protected - Accessible within the class and subclasses
  • ~
    Package - Accessible within the same package
  • +
    Public - Accessible from anywhere
Class Diagram Example
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Visibility Modifiers Example

Abstract Classes

Abstract classes cannot be instantiated directly and are used as base classes. Use the abstract class or abstract keyword.

Class Diagram Example
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Abstract Classes Example

Interfaces

Interfaces define contracts that classes must implement. They contain only method signatures without implementations.

Class Diagram Example
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Interfaces Example

Enumerations

Enumerations represent a fixed set of constants. Use the enum keyword to define them.

Class Diagram Example
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Enumerations Example

Other Class Types

SparkChart supports various other class types for different modeling needs.

Class Diagram Example
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Other Class Types Example

Class Aliases

Use the as keyword to create shorter aliases for classes with long names, or to provide display names.

Class Diagram Example
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Class Aliases Example
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