| Origin: |
Grand 98 |
| Reason: |
A class needs to be independent of services provided by another class. |
| Synopsis: |
Abstract a class C by writing an interface IF.
Clients access class C through interface IF.
|
| Example: |
A business application uses an Address class in a variety
of objects, e.g., Vendors, Clients,
Freight companies, etc.
To make these objects less dependent of the details
of the Address class, the objects should rather use
an interface, AddressIF.
|
| Solution: |
| Service |
A class that provides data and/or methods to the Client. |
Address |
| Client |
A class that uses the services of class Service. |
Vendor, Client, etc. |
| ServiceIF |
Interface of class Service. |
AddressIF |
|
| See also: |
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