Class Diagram

Class diagrams are the standard UML notation for documenting object-oriented designs. Use them to visualize classes, their attributes and methods, and the relationships between them.

Syntax Highlighting

Syntax highlighting integrates directly with IntelliJ’s color scheme system, so diagram colors always match your editor theme.

Armada Dark

Islands Dark

Islands Light

IDE Support

Mermaid Studio provides comprehensive support for class diagrams:

• Syntax highlighting for classes, members, and relationships
• Code completion for class syntax and relationship types
• Rename refactoring to update class names across the diagram
• Find usages to locate class references
• Code folding to collapse class definitions
• Formatting to keep your diagrams tidy
• Inspections to catch common errors
• Brace matching for class body navigation
• Code Vision showing relationship counts inline
• Color provider for customizing diagram colors

Quick Syntax Reference

Defining Classes

classDiagram
    class ClassName {
        +publicMember
        -privateMember
        #protectedMember
        ~packageMember
        +publicMethod()
        -privateMethod() returnType
    }

Relationships

Syntax	Meaning
<|--	Inheritance
*--	Composition
o--	Aggregation
-->	Association
..>	Dependency
..|>	Realization

Cardinality

classDiagram
    Customer "1" --> "*" Order : places

For full syntax details, see the Mermaid class diagram documentation.