Adding parameters to operations

In UML diagrams, you can add parameters to pass information into and out of operations.

You must have a diagram open in the diagram editor, and the operations list compartment must be visible. Ensure that you have not set preferences to filter or hide operations. To see the parameters that you add to an operation in a classifier, you must modify the classifier’s properties to show operation signatures.
To add a parameter to an operation:
  1. In the diagram editor, click an operation to select it and click the selection to edit it.
  2. In the parentheses, type the parameter’s direction kind (if applicable), name, type expression, and default value in the following syntax:
    operation ([direction] name : type-expression = default-value)
    For example: getBalance([in] day : Date = 01/01/2005)
  3. Optional: To add a return type, type the information after the parentheses. For example: getBalance(day : Date = 01/01/2005) : MoneyType
Tip: You can also add parameters to operations in the Model Explorer view.

Parent topic: Modifying parameters, literals, and signals in classifiers

Related concepts
Parameters

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