December 2017
Intermediate to advanced
271 pages
7h 5m
English
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14Derived Properties
In certain cases, a property may have the only purpose to provide some information that is computed from other information items. For such a derived property, there is no point to allow the user entering a value for it. Examples of derived properties of a class Person are the attributes age and initials. The value of age is computed on demand from the value of the attribute dateOfBirth and the current year. The value of initials is computed from the values of the attributes firstName and lastName.
Unlike in the case of standard properties, the value of a derived property cannot be set by the user. Rather, it is computed from the values of other properties. Consequently, it does not have a setter, but only a getter method. ...
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