Packages and Subsystems

• Interfaces offer part of the behavior of packages (subsystems!)

  • realized by means of an arbitrary number of classes within the package

• Packages can be nested

  • semantics is determinedby the implementation language
  • arbitrary depth
  • package hierarchy forms a tree

Package X

Class A

Package Y

Class B

Class A

Class B

Package X

Class C

Class D

«subsystem» Package Y

I

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