| class PhoneCall: | |
| _origin = '' | |
| _destination = '' | |
| _duration = 0 | |
| def set_duration(self, durationInSeconds): | |
| self._duration = durationInSeconds | |
| def get_duration(self): | |
| return self._duration | |
| #duration is exposed in seconds as a ripple effect | |
| #this violates information hiding principle and prevents us from changing it representation |
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