Save and open excel file in java -

i want export data on 'jtable' excel file , when export successful massage dialog box displayed , user can ether choose open saved file or not. have figured out how save file. i'm not sure how open file saved. in order believe these 2 lines need fixed.

desktop dt = desktop.getdesktop(); dt.open(new file(this.file)); 

below coding far.

private void exportbuttonactionperformed(java.awt.event.actionevent evt) {                                                  try{         jfilechooser fc = new jfilechooser();         int option = fc.showsavedialog(searchgui.this);         if(option == jfilechooser.approve_option){             try{                 string filename = fc.getselectedfile().getname();                  string path = fc.getselectedfile().getparentfile().getpath();                  int len = filename.length();                 string ext = "";                 string file = "";                  if(len > 4){         ext = filename.substring(len-4, len);                 }                  if(ext.equals(".xls")){         file = path + "\\" + filename;                  }else{         file = path + "\\" + filename + ".xls";                  }                 toexcel(phonebook, new file(file));                 int answer = joptionpane.showconfirmdialog(null, "would open exported file?", "successfully exported!", option);                 if (answer == joptionpane.yes_option) {                     try {                         desktop dt = desktop.getdesktop();                         dt.open(new file(this.file));                      } catch (exception e ){                                     joptionpane.showmessagedialog(null, e);                     }                 }                  }catch(exception e){                                 joptionpane.showmessagedialog(null, e);                 }         }     }     catch(exception e){     joptionpane.showmessagedialog(null, e);     } } 

please help!!

caught error should be

desktop dt = desktop.getdesktop(); dt.open(new file(file)); 

instead of

desktop dt = desktop.getdesktop(); dt.open(new file(this.file));