Library management class diagram template

Classes in this class diagram

• Library — 3 members
• Book — 4 members
• BookCopy — 3 members
• Member — 4 members
• Loan — 4 members
• Reservation — 3 members
• Fine — 3 members

How to use this class diagram template

1. Click Open in the editor. The class diagram opens on a new page in FlowDiagram — nothing is uploaded and there is no sign-up.
2. Rename, add or delete shapes and drag them where you want; connectors stay attached as things move.
3. Drop in vendor logos from the library — 1,160 of them, including every AWS, Azure and Google Cloud service icon — or restyle it with the colour and theme controls.
4. Prefer text? Edit the Mermaid source below and paste it in through ☰ → Import diagram (see the Mermaid editor); it imports as an editable diagram.
5. Export to PNG, SVG or PDF, or press Ctrl+L for a link that carries the whole diagram.

Mermaid source

The whole template is the text below. Paste it into FlowDiagram, keep it in Git next to the code it describes, or hand it to an AI assistant to extend.

classDiagram
  class Library {
    +String name
    +String address
    +search(String query) Book[]
  }
  class Book {
    +String isbn
    +String title
    +String author
    +int year
  }
  class BookCopy {
    +String barcode
    +String shelf
    +bool available
  }
  class Member {
    +String memberId
    +String name
    +int maxLoans
    +borrow(BookCopy copy) Loan
  }
  class Loan {
    +Date borrowedOn
    +Date dueOn
    +Date returnedOn
    +isOverdue() bool
  }
  class Reservation {
    +Date placedOn
    +String status
    +cancel() void
  }
  class Fine {
    +Decimal amount
    +bool paid
    +pay() void
  }
  Library o-- Book
  Book "1" *-- "1..*" BookCopy : copies
  Member "1" --> "*" Loan : borrows
  Loan "*" --> "1" BookCopy : of
  Member "1" --> "*" Reservation : places
  Reservation "*" --> "1" Book : for
  Loan "1" --> "0..1" Fine : may incur

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