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Design Issue: Implementation and Interface Inheritance

• Interface inheritance: subclass can only see parent's interface
  • Adv.--preserves encapsulation
  • Disadv.--can result in inefficiencies

• Implementation inheritance: subclass can see both the interface and the implementation of parent
  • Disadv.--changes to the parent class require recompilation of subclasses, and sometimes even modification of subclasses
  • Disadv.--subclass can introduce errors in parent