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# Introduction
## Interfaces
Abstract class used to define object API.
Classes can then implement this API.
```
public interface Car {
public void turn(blabla);
blabla;
}
```
### Polymorphism
Most general interface is Object (like golangs interface{} ? ).
## Encapsulations
Hide internal details.
This can be done with getters and setters.
These getters and setters can then be used to to input validation.
## Private vs protected
Protected are accessible to subclasses which inherit from it.
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