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Message: [QUOTE="Fo, post: 3698120"] Dear all, I am trying to parse a textual file into classes. For each line (or 2-3 consecutive lines), there is the definition of an object. The objects are fixed and the structure of the line is also predetermined (space-separated file). I am not using a regular-expression parser or a scanner (like JFlex) because the syntax is pretty easy. An example of line is: "OBJ1 FIELD1 FIELD2 FIELD3 FIELD4 FIELD5" Up to now I explicitly created the classes defining the object and I parsed the content using String.substring(i,j), for each line. It works well but I was wondering if it was possible to: 1. Define the class JIT, I mean given a description of classes with the name of the class, the description of the fields and the indexes of the fields, generate automatically the class.It is a kind of metaprogramming, I suppose. 2.Invoke a method or a field of a class defined by a String [...] Object obj ;// defined somewehere else String nameField="field1"; obj.nameField="AAA"; //this should read obj.field1="AAA" [...] I suppose that it is possible to do it using java.lang.Class.getFields () and then using Fields.set(...) checking if the name of the field is the one I want to change. Is it the correct way? Thank you Fo [/QUOTE]