How to use custom class loader ?

Extend your class with ClassLoader and override method findClass()

class CustomClassLoader extends ClassLoader {

      String host;

      int port;

      public Class findClass(String name) {

          byte[] b = loadClassData(name);

          return defineClass(name, b, 0, b.length);

      }

      private byte[] loadClassData(String name) {

          // load the class data from the connection

      }

}

Then to load your class :

Class r = new CustomClassLoader().findClass("com.genius.MyClass");

OR

Class.forName("com.genius.MyClass", true, new CustomClassLoader());