Reflection + Super Classe

publci class Transacao{
String codigoRede
}
 public class AlteraValorCampo extends Transacao{
     public double d;
	
     public static void main(String args[]) {
         try {
             Class cls = Class.forName("AlteraValorCampo");
             Field fld = cls.getField("d");
			AlteraValorCampo f2obj = new AlteraValorCampo();
			
			
			Object obj=new AlteraValorCampo ();
             System.out.println("d = " + f2obj.d);
             fld.setDouble(f2obj, 12.34);
             System.out.println("d = " + f2obj.d);
				System.out.println(obj.getClass().getDeclaredField("d"));
			System.out.println(obj.getClass().getDeclaredField("codigoRede"));
         }
    
		catch (Exception e) {e.printStackTrace();}
		
     }
     
 }

java.lang.NoSuchFieldException: java.lang.String

at java.lang.Class.getDeclaredField(Class.java:1216)

at AlteraValorCampo.main(AlteraValorCampo.java:23)