Thread: how to load a class and type cast to that class?

hi friends,
my code is like this,

  .........
  Class c=new Class(test);
  Object obj= c.newInstance();

here ,
i have a unknown class which is represented by a test
now i want to call the methods of that unknown class
how to call?
i don't know the name of the class, i can get ,
but how to cast obj into that class and call the methods?
u suppose u'r own methods of unknown class?

please tell me if know the logic here.
thank u

If you now that your class will either all inherit from another class, or implement an interface, you can use polymorphism to call methods of that super class, or from the interface.