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Visibility is not shown in the SysML notation.
3.3.3 Operation
class Customer with operation
Customer
pinCheck(pin:String):Boolean
FIGURE 3-10
Operation of the class ???customer.???
3.3 The Class Diagram
Defi nition
An operation defines a behavior property of a class. The description consists
of a visibility, a name, as well as parameters and a return type.
The behavior of a class is largely described by the sum of its operations. The class
customer in Figure 3.10 has an operation called pinCheck(/) with an input parameter,
pin:String , and a return type, Boolean . The input parameter passed on to this
operation is a string ( pin:String ). It verifies whether or not the string corresponds
to the PIN of that customer and returns a Boolean value (true/false) as the result.
The actual verification of a PIN is part of the implementation of the operation, but
you can ??™ t see it in the class diagram. Often it is not directly described in the UML
model either. It is often described in mechanical or electronic components, for
example, in a hardware development project.


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