Although the type of o2 is an interface, getSuperclass() returns the object's superclass : Interface « Reflection « Java Tutorial

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Java Tutorial » Reflection » Interface 
7.2.6.Although the type of o2 is an interface, getSuperclass() returns the object's superclassPrevious/Next
public class Main {
  public static void main(String[] argvthrows Exception {

    Runnable o2 = new Runnable() {
      public void run() {
      }
    };
    Class sup = o2.getClass().getSuperclass()// java.lang.Object
  }
}
7.2.Interface
7.2.1.The superclass of interfaces is always null
7.2.2.Listing the Interfaces That an Interface Extends
7.2.3.Checking whether String is an interface or class
7.2.4.If a class object is an interface or a class
7.2.5.Listing the Interfaces That a Class Implements
7.2.6.Although the type of o2 is an interface, getSuperclass() returns the object's superclass
7.2.7.The interfaces for a primitive type is an empty array
7.2.8.Return Returns true if type is implementing Map
7.2.9.Returns true if a class implements Serializable and false otherwise.
7.2.10.Get Super Interfaces
7.2.11.Get all interface and object classes that are generalizations of the provided class
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