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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.