Obtaining object reference of a loaded class

Question

I want to obtain the reference of any class which is allready loaded dynamically.
I have given a sample code to understand it better...
I am in a serious need of this solution, Plz. have a look.
Thankx in advance.
class FindObjRef
     void find(String obj) throws Exception
          String str1 = new String("Hello!");
          String str2 = new String("World!");
          // Here I want to invoke trim() method (through reflection) on the instance of either str1 or str2 depending what obj parameter contains.
          // I do not want to write a if-else-if statement.
     public static void main(String[] args) throws Exception
          FindObjRef findObj = new FindObjRef();
          findObj.find("str1");
          findObj.find("str2");
}

Answer 1

An alternative solution could be a Map, with the variable names as keys and the values as values.