# Object Diagram

![Object Diagram (from uml-diagrams.org)](https://content.gitbook.com/content/aNbtXAm2MUsbrMlAEZb1/blobs/l1TwEkVdeOLUt9H5f1Oj/Login%20Controller.png)

## Create Object Diagram

To create a Object Diagram:

1. Select first an element where a new Object Diagram to be contained as a child.
2. Select **Model | Add Diagram | Object Diagram** in Menu Bar or select **Add Diagram | Object Diagram** in Context Menu.

> **See also**
>
> [UML Object Diagram](http://www.uml-diagrams.org/class-diagrams-overview.html#object-diagram) - For more information about UML Object Diagram.

## Object

To create a Object:

1. Select **Object** in **Toolbox**.
2. Drag on the diagram as the size of Object.

You can use **QuickEdit** for Object by double-click or press `Enter` on a selected Object.

* **Name Expression** : Edit name expression.

  *Syntax of Name Expression*

  ```
  expression ::= [ '<<' stereotype `>>` ] [ visibility ] name
  stereotype ::= (identifier)
  visibility ::= '+' | '#' | '-' | '~'
  name ::= (identifier)
  ```
* **Visibility** : Change visibility property.
* **Add Note** : Add a linked note.
* **Add Constraint** : Add a constraint.
* **Add Slot** (`Ctrl+Enter`) : Add a slot.
* **Add Linked Object** : Add a linked object.

## Slot

To add an Slot:

1. Select an Instance.
2. Select **Model | Add | Slot** in Menu Bar or **Add | Slot** in Context Menu.

You can use **QuickEdit** for Slot by double-click or press `Enter` on a selected Slot.

* **Slot Expression** : Edit Slot expression.

  *Syntax of Slot Expression*

  ```
  slot ::= [ '<<' stereotype `>>` ] [ visibility ] name [':' type ] [ '=' value ]
  stereotype ::= (identifier)
  visibility ::= '+' | '#' | '-' | '~'
  name ::= (identifier)
  type ::= (identifier)
  value ::= (string)
  ```
* **Visibility** : Change visibility property.
* **Add** (`Ctrl+Enter`) : Add one more slot in the below.
* **Delete** (`Ctrl+Delete`) : Delete the slot
* **Move Up** (`Ctrl+Up`) : Move the slot up.
* **Move Down** (`Ctrl+Down`) : Move the slot down.

## Artifact Instance

To create a Artifact Instance:

1. Select **Artifact Instance** in **Toolbox**.
2. Drag on the diagram as the size of Artifact Instance.

You can use **QuickEdit** for Model Element (See [Model Element](https://docs.staruml.io/class-diagram#model-element)).

## Component Instance

To create a Component Instance:

1. Select **Component Instance** in **Toolbox**.
2. Drag on the diagram as the size of Component Instance.

You can use **QuickEdit** for Model Element (See [Model Element](https://docs.staruml.io/class-diagram#model-element)).

## Node Instance

To create a Node Instance:

1. Select **Node Instance** in **Toolbox**.
2. Drag on the diagram as the size of Node Instance.

You can use **QuickEdit** for Model Element (See [Model Element](https://docs.staruml.io/class-diagram#model-element)).

## Link

To create an Link (or Directed Link):

1. Select **Link** (or **Directed Link**) in **Toolbox**.
2. Drag from an instance and drop on another instance.

You can use **QuickEdit** for Relationship (See [Relationship](https://docs.staruml.io/class-diagram#relationship)).

You can also use **QuickEdit** for LinkEnd by double-click at the end side of an Link.

* **Name Expression** : Edit name expression.

  *Syntax of Name Expression*

  ```
  expression ::= [ '<<' stereotype `>>` ] [ visibility ] name
  stereotype ::= (identifier)
  visibility ::= '+' | '#' | '-' | '~'
  name ::= (identifier)
  ```
* **Visibility** : Change visibility property.
* **Navigability** : Change navigability property.
* **Aggregation Kind** : Change aggregationKind property.
* **Multiplicity** : Change multiplicity property.

## Link Object

To create a Link Object (instance of Association Class) by linking two Instances:

1. Select **Link Object** in **Toolbox**.
2. Drag from an element and drop on another element.
3. A Link Object is created between the instances.

To create a Link Object by linking Link and Object:

1. Select **Link Object** in **Toolbox**.
2. Drag from a Link (or Object) and drop on an Object (or Link).
3. The Object will be connected to the Link.


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