Java/Reflection/SuperClass

Although the type of o2 is an interface, getSuperclass() returns the object"s superclass

   <source lang="java">

public class Main {

 public static void main(String[] argv) throws Exception {
   Runnable o2 = new Runnable() {
     public void run() {
     }
   };
   Class sup = o2.getClass().getSuperclass(); // java.lang.Object
 }

}

 </source>
   
  
 
  

Getting the Superclass of an Object

   <source lang="java">

public class Main {

 public static void main(String[] argv) throws Exception {
   Object o = new String();
   Class sup = o.getClass().getSuperclass(); // java.lang.Object
 }

}

 </source>
   
  
 
  

Retrieving other information through the class pointer

   <source lang="java">

public class Main {

 public static void main(String[] argv) throws Exception {
   Class cc = null;
   cc = Main.class;
   System.out.println("The name of the superclass is " + cc.getSuperclass());
   System.out.println("Is SalariedEmployee an interface? " + cc.isInterface());
 }

}

 </source>
   
  
 
  

Superclass of Object is null

   <source lang="java">

public class Main {

 public static void main(String[] argv) throws Exception {
   Object o = new Object();
   Class sup = o.getClass().getSuperclass(); // null
 }

}

 </source>
   
  
 
  

The superclass of primitive types is always null

   <source lang="java">

public class Main {

 public static void main(String[] argv) throws Exception {
   Class cls = int.class;
   Class sup = cls.getSuperclass(); // null
 }

}

 </source>