| Abstraction | Hermetization |
|---|---|
| Solves problems on design level | Solves problems upon implementation |
| Serves to hide unneeded info, focused on important things | Hides code and data in one unit, protecting them from external world |
| Focused on what object does, not how | Hides details and mechanisms responsible for how object does things |
| Is a wider point of view on object upon design | Hides implementation details responsible for actions |
| Example: | Example: |
| Look at old phone, you see screen and buttons to select number | Inside details of phone implementation are: how screen work, how buttons work, how its connected. |