javafx - How to append more than two folders to user.home java -


guys! i'm trying append folder user.home property. working nice, while i'm using 1 additional folder. when try make 2 additions (so looks user.home+folder1+folder2+folder3) trows --- java.lang.illegalargumentexception: folder parameter must valid folder--- . though there restriction, can't find out where. 

    string fullroute = null;     file homedir = new file("mlog");     if (!siteco.geteditor().gettext().isempty() &&              !incidate.geteditor().gettext().isempty()) {             homedir.mkdirs();        fullroute = system.getproperty("user.home") + file.separator +       //savevarto.getlastvisiteddirectory() +                     savevarto.addpath(siteco.getvalue().tostring()) +       file.separator + savevarto.addpath(incidate.getvalue().tostring());         }         else {homedir.mkdirs();     //   file.separator+homedir.tostring() - without              fullroute =      system.getproperty("user.home")+file.separator+homedir.tostring();}                 system.out.println(fullroute);              filechooser.setinitialdirectory(new file(fullroute));         filechooser.getextensionfilters().addall(                 new filechooser.extensionfilter("xml files", "*.xml"));   //sample of method public class variables{ public string addpath(string name) {          if (!name.isempty()) {             //file nou = new file(getlastvisiteddirectory() +"\\" + name);              file nou = new file(name);             if (!nou.exists()) {                 nou.mkdirs();              } else {                 system.out.println("folder exists");             }           }         else{name = null;}         return name;     }} 

 string fullroute = null;     file homedir = new file(system.getproperty("user.home"));      if (siteco.getvalue() !=null && incidate.getvalue() !=null) {          system.out.println(savevarto.getmainfolder());         fullroute = homedir + file.separator + savevarto.getmainfolder() +                 file.separator + siteco.getvalue().tostring() +      file.separator + incidate.getvalue().tostring();      } else {         fullroute = homedir.tostring();     }      system.out.println(fullroute);     file fhd = new file(fullroute);     if (!fhd.exists())         fhd.mkdirs();     filechooser.setinitialdirectory(fhd);     filechooser.getextensionfilters().addall(             new filechooser.extensionfilter("xml files", "*.xml"));

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