In UML models, you can specify default values for association ends, attributes, and parameters. Attributes and association ends take default values which are also called initial values when instances of classifiers are created. The parameters of an operation take default values if the call to the operation does not pass explicit parameter values.
Setting the default values of attributes and association ends
In UML models, you can specify the default value that an attribute takes when an instance of a classifier is created. You can also specify the default values of association ends.Setting the default values of parameters
In UML models, you can specify the default value that a parameter is assigned if an operation is called without being passed explicit parameter values.
Parent topic: Setting the properties of a model element
Related concepts
Model element properties
Model element default values