Type Casting to a Class

Question

I'm getting an instance of a class through the newInstance() method.I want to access that class members through this newly created object.But to do this, I have to typecast the object by its class name.In my case, the class is a dynamic one(i.e., unknown at the time of creating that object).I get the class name as a string through the getName() method.
HOW CAN I DO THE TYPE CASTING OR IS THERE ANY OTHER METHOD TO SOLVE THIS TYPE OF PROBLEM.
Example :
In this example, i have created an object t2 in the same class.but,in actual case, that object is created in some other program called test2. And test2 doesnt know abt the class(test1) being used.And is being determined at runtime (i.e., dynamical).
class test1
     int i = 10;
     String s;
     public static void main(String a[]) throws InstantiationException, IllegalAccessException, ClassNotFoundException
          test1 t = new test1();
          System.out.println("I = " + t.i);
          System.out.println("Class Name = " + t.getClass().getName());
          t.s = t.getClass().getName();
          Object t2 = t.getClass().newInstance();
          System.out.println("t2 I = " + ((test1)t2).i);
          System.out.println("t2 Class Name = " + t2.getClass().getName());

Answer 1

If you have no idea what members the class could have in compile time, then how can you set them in runtime?
I think you should give another though to your OO design...