public CodeType addSubjectTypeElement() {//2 
      CodeType t = new CodeType();
      if (this.subjectType == null)
        this.subjectType = new ArrayList<CodeType>();
      this.subjectType.add(t);
      return t;
    }
public CodeType addSubjectTypeElement ( ) { CodeType t = new CodeType ( ) ; if ( this . subjectType == null ) this . subjectType = new ArrayList < CodeType > ( ) ; this . subjectType . add ( t ) ; return t ; }
syntactic sugar