```mermaid
---
title: gui
---
classDiagram
    class JPanel
    class BorderPanel {
        #Borderpanel()
    }
    class SheetPanel {
        +SheetPanel(int rows, int columns)
    }
    class StatusPanel {
        #StatusPanel(StatusLabel statusLabel)
    }
    class GridPanel {
        +GridPanel(int rows, int columns)
    }
    class RowLabels {
        -RowLabels(int row)
    }
    class SlotLabels {
        -List~SlotLabel~ labelList
        +SlotLabels(int rows, int cols)
    }

    JPanel <|-- BorderPanel
    JPanel <|-- GridPanel
    GridPanel <|-- RowLabels
    BorderPanel <|-- SheetPanel 
    BorderPanel <|-- StatusPanel
    GridPanel <|-- SlotLabels
```
```mermaid
classDiagram
    class JLabel
    class Observer
    class ColoredLabel {
        +ColoredLabel(String text)
        +ColoredLabel(String text, Color color)
        +ColoredLabel(String text, Color color, int alignment)
    }
    class SlotLabel {
        +SlotLabel()
    }
    class CurrentLabel {
        +CurrentLabel()
    }
    class StatusLabel {
        +StatusLabel()
        +update(Observable observable, Object object)
    } 

    <<interface>> Observer

    ColoredLabel <|-- SlotLabel   
    JLabel <|-- ColoredLabel
    ColoredLabel <|-- CurrentLabel
    ColoredLabel <|-- StatusLabel
    Observer <-- StatusLabel
```

```mermaid
classDiagram
    class JFrame
    class XL {
        -static final int ROWS = 10, COLUMNS = 8
        -XLCounter counter
        -StatusLabel statusLabel
        -XLList xlList
        +XL(XL oldXL)
        +XL(XLList xlList, XLCounter counter)
        +rename(String title)
        +main(String[] args)
    }
    class JTextField
    class Editor {
        +Editor()
    }
    class XLCounter {
        -int counter
        +increment()
        +toString()
    }
    class Observable
    class Iterable
    class XLList {
        -List~XL~ list
        +add(XL xl) 
        +isEmpty() boolean
        +iterator() Iterator~XL~
        +last() XL
        +remove(Xl xl)
        +setChanged()
    }

    <<interface>> Iterable

    JTextField <|-- Editor
    JFrame <|-- XL
    Observable <|-- XLList
    Iterable <-- XLList
```

```mermaid
---
title: gui.menu
---
classDiagram
    class ClearAllMenuItem {
        +ClearAllMenuItem()
        +actionPerformed(ActionEvent e)
    }
    class ClearMenuItem {
        +ClearMenuItem()
        +actionPerformed(ActionEvent e)
    }
    class CloseMenuItem {
        -XL xl
        -XLList xlList
        +CloseMenuItem(XL xl, XLList, xlList)
        +actionPerformed(ActionEvent event)
    }
    class LoadMenuItem {
        +LoadMenuItem(XL xl, StatusLabel statusLabel)
        #action(String path)
        #openDialog(JFileChooser fileChooser) int
    }
    class NewMenuItem {
        -XL xl
        +NewMenuItem(XL xl)
        +actionPerformed(ActionEvent event)
    }
    class OpenMenuItem {
        #StatusLabel statusLabel
        #XL xl
        #OpenMenuItem(XL xl, StatusLabel statusLabel, String title)
        #action(String path)
        +actionPerformed(ActionEvent event)
        #openDialog(JFileChooser fileChooser)
    }
    class SaveMenuItem {
        +SaveMenuItem(XL xl, StatusLabel statusLabel)
        #action(String path)
        #openDialog(JFileChooser fileChooser)
    }
    class WindowMenuItem {
        -XL xl
        +WindowMenuItem(XL xl)
        +actionPerformed(ActionEvent event) 
    }
    class JMenuItem
    class ActionListener
    <<interface>> ActionListener
 

    JMenuItem <|-- ClearAllMenuItem
    ActionListener <-- ClearAllMenuItem
    JMenuItem <|-- ClearMenuItem
    ActionListener <-- ClearMenuItem
    JMenuItem <|-- CloseMenuItem
    ActionListener <-- CloseMenuItem
    OpenMenuItem <|-- LoadMenuItem
    JMenuItem <|-- NewMenuItem
    ActionListener <-- NewMenuItem
    JMenuItem <|-- OpenMenuItem
    ActionListener <-- OpenMenuItem    
    OpenMenuItem <|-- SaveMenuItem
    JMenuItem <|-- WindowMenuItem
    ActionListener <-- WindowMenuItem

```

```mermaid
classDiagram
    class JMenu
    class Observer
    class WindowMenu {
        -XLList xlList
        +WindowMenu(XLList xlList)
        +update(Observable observable, Object object)
    }
    class JMenuBar
    class XLMenuBar {
        +XLMenuBar(XL xl, XLList xlList, StatusLabel statusLabel)
    }
    <<interface>> Observer

    JMenuBar <|-- XLMenuBar
    JMenu <|-- WindowMenu
    Observer <-- WindowMenu
```