String super_class_name = classDef.superClass.toString();
String[] interfaces = getInterfaceArray(classDef);
int access_flags = getClassAccessFlags(classDef);
ClassGen classGen = new ClassGen(class_name,super_class_name,classDef.fileName,
access_flags, interfaces);
instructionFactory = new InstructionFactory(classGen) ;
classGen.setMajor(50) ;
classGen.setMinor(0) ;
}