tableview - How to access table data from outside the controller in javafx -

i'm trying create material inventory program uses tableview. have controller show statistics based on tableview i'm not sure how access live data view.

my mainapp loads last saved table , materialoverviewcontroller has tableview.

i have rootlayoutcontroller main layout controller has simple file menu onfloorstatscontroller loaded from.

i can create new mainapp when onfloorstatscontroller loaded loads sample data entered default.

how access live data mainapp?

here mainapp code:

public class mainapp extends application {      private stage primarystage;     private borderpane rootlayout;      private observablelist<material> materialdata = fxcollections.observablearraylist();      @override     public void start(stage primarystage) {         this.primarystage = primarystage;         this.primarystage.settitle("label inventory");         this.primarystage.geticons().add(new image("file:resources/images/1462487405_mask.png"));          initrootlayout();         showmaterialoverview();     }      public mainapp() {         // add sample data      }      public observablelist<material> getmaterialdata() {         return materialdata;     }      /**      * initializes root layout , tries load last opened      * material file.      */     public void initrootlayout() {         try {             // load root layout fxml file.             fxmlloader loader = new fxmlloader();             loader.setlocation(mainapp.class                     .getresource("rootlayout.fxml"));             rootlayout = (borderpane) loader.load();              // show scene containing root layout.             scene scene = new scene(rootlayout);             primarystage.setscene(scene);              // give controller access main app.             rootlayoutcontroller controller = loader.getcontroller();             controller.setmainapp(this);              primarystage.show();         } catch (ioexception e) {             e.printstacktrace();         }          // try load last opened person file.         file file = getmaterialfilepath();         if (file != null) {             loadmaterialdatafromfile(file);         }     }         public void showmaterialoverview() {         try {             // load material overview.             fxmlloader loader = new fxmlloader();             loader.setlocation(mainapp.class.getresource("materialoverview.fxml"));             anchorpane materialoverview = (anchorpane) loader.load();              // set material overview center of root layout.             rootlayout.setcenter(materialoverview);              // give controller access main app.             materialoverviewcontroller controller = loader.getcontroller();             controller.setmainapp(this);          } catch (ioexception e) {             e.printstacktrace();         }     }        public void showonfloorstatistics() {         try {             // load fxml file , create new stage popup.             fxmlloader loader = new fxmlloader();             loader.setlocation(mainapp.class.getresource("onfloorstats.fxml"));             anchorpane page = (anchorpane) loader.load();             stage dialogstage = new stage();             dialogstage.settitle("material on floor");             dialogstage.initmodality(modality.window_modal);             dialogstage.initowner(primarystage);             scene scene = new scene(page);             dialogstage.setscene(scene);              // set material controller.             onfloorstatscontroller controller = loader.getcontroller();             controller.start(dialogstage);              dialogstage.show();          } catch (ioexception e) {             e.printstacktrace();         }     }      public void showbarcharttest() {         try {             // load fxml file , create new stage popup.             fxmlloader loader = new fxmlloader();             loader.setlocation(mainapp.class.getresource("barcharttestlayout.fxml"));             anchorpane page = (anchorpane) loader.load();             stage dialogstage = new stage();             dialogstage.settitle("detailed bar chart");  //             dialogstage.initmodality(modality.window_modal);             dialogstage.initowner(primarystage);             scene scene = new scene(page);             dialogstage.setscene(scene);              // set material controller.             barcharttest controller = loader.getcontroller();             controller.start(dialogstage);              dialogstage.show();          } catch (ioexception e) {             e.printstacktrace();         }     }        /**      * returns main stage.      * @return      */     public stage getprimarystage() {         return primarystage;     }      public static void main(string[] args) {         launch(args);     } } 

and here materialoverviewcontroller code:

public class materialoverviewcontroller {     @fxml     private tableview<material> materialtable;       private list<material> materialid;      public tableview<material> getmaterialtable() {         return materialtable;     }  //    public void setmaterialtable(tableview<material> materialtable) { //        this.materialtable = materialtable;     }      private observablelist<integer> rollstotal = fxcollections.observablearraylist();     private observablelist<string> materialnames = fxcollections.observablearraylist();        // reference main application.     private mainapp mainapp;      /**      * constructor.      * constructor called before initialize() method.      */     public materialoverviewcontroller() {     }      /**      * initializes controller class. method automatically called      * after fxml file has been loaded.      */     @fxml     private void initialize() {         materialtotal = 0;         // initialize material table columns.         ponumbercolumn.setcellvaluefactory(celldata -> celldata.getvalue().ponumberproperty());         materialnamecolumn.setcellvaluefactory(celldata -> celldata.getvalue().materialnameproperty());         materialidcolumn.setcellvaluefactory(celldata -> celldata.getvalue().materialidproperty());         materialwidthcolumn.setcellvaluefactory(celldata -> celldata.getvalue().materialwidthproperty().asobject());         qtyorderedcolumn.setcellvaluefactory(celldata -> celldata.getvalue().qtyorderedproperty().asobject());         qtyreceivedcolumn.setcellvaluefactory(celldata -> celldata.getvalue().qtyreceivedproperty().asobject());         qtybackorderedcolumn.setcellvaluefactory(celldata -> celldata.getvalue().qtybackorderedproperty().asobject()); //        qtybackorderedcolumn.setcellvaluefactory(celldata -> celldata.getvalue().qtybackorderedproperty().asobject());         qtyonfloorcolumn.setcellvaluefactory(celldata -> celldata.getvalue().qtyonfloorproperty().asobject()); //        dateorderedcolumn.setcellvaluefactory(celldata -> celldata.getvalue().dateorderedproperty().asstring());         dateorderedcolumn.setcellvaluefactory(celldata -> celldata.getvalue().dateorderedproperty().asstring());         estarrivalcolumn.setcellvaluefactory(celldata -> celldata.getvalue().dateexpectedproperty().asstring());         suppliercolumn.setcellvaluefactory(celldata -> celldata.getvalue().supplierproperty());          // clear material details.         showmaterialdetails(null);          // listen selection changes , show material details when changed.         materialtable.getselectionmodel().selecteditemproperty().addlistener(                 (observable, oldvalue, newvalue) -> showmaterialdetails(newvalue));      }      public void setmainapp(mainapp mainapp) {         this.mainapp = mainapp;          // add observable list data table         materialtable.setitems(mainapp.getmaterialdata());     }      private void showmaterialdetails(material material) {         if (material != null) {             // fill labels info material object.             ponumberlabel.settext(material.getponumber());             materialidlabel.settext(material.getmaterialid());             materialnamelabel.settext(material.getmaterialname());             materialwidthlabel.settext(string.valueof(material.getmaterialwidth()));             qtyorderedlabel.settext(integer.tostring(material.getqtyordered()));             qtyrecievedlabel.settext(integer.tostring(material.getqtyreceived()));             qtybackorderedlabel.settext(integer.tostring(material.getqtyordered()-material.getqtyreceived())); //            qtybackorderedlabel.settext(integer.tostring(material.getqtybackordered()));             qtyonfloorlabel.settext(integer.tostring(material.getqtyonfloor())); //            dateorderedlabel.settext(dateutil.format(material.getdateordered())); //            dateorderedlabel.equals(dateutil.format(material.getdateordered())); //            dateorderedlabel.settext(datepicker(string.valueof(material.getdateordered()); //            estarrivallabel.settext(material.getsupplier());             supplierlabel.settext(material.getsupplier());              string pattern = "mm/dd/yyyy"; //            datetesttextfield.settext(dateutil.format(material.getbirthday()));             dateorderedlabel.settext(dateutil.format(material.getdateordered()));             estarrivallabel.settext(dateutil.format(material.getdateexpected()));             //todo: set running material totals //            getmaterialnames(arrays.aslist(material));             handleselectmaterial();          }          }     }       public list getmaterialnames(list<material> materials) {          (material name : materials) {             mainapp.getmaterialdata();             if (!materialnames.contains(name)) {                 materialnames.add(name.getmaterialname());             }         }         (string name : materialnames) {             materialtextfield.settext(name + "\n");         }         return arrays.aslist(materialnames);     }       }  } 

here bit of code works rootlayoutcontroller i'm not sure why can't same thing onfloorstatscontroller:

public void setmainapp(mainapp mainapp) {     this.mainapp = mainapp; }  @fxml private void handleprint() {      fxmlloader fxmlloader = new fxmlloader();     fxmlloader.setlocation(getclass().getresource("materialoverview.fxml"));     try {         anchorpane frame = fxmlloader.load();     } catch (ioexception e) {         e.printstacktrace();     }     materialoverviewcontroller c = fxmlloader.getcontroller();      //loads data table     c.setmainapp(mainapp); 

i need access live data materialovewviewcontroller

here's onfloorstatscontroller:

    private mainapp mainapp;     public tableview<material> material;     /**      * called main application give reference itself.      *      * @param mainapp      */      public void setmainapp(mainapp mainapp) {         this.mainapp = mainapp;     }    //    final static string austria = "14532"; //    final static string brazil = "78333"; //    final static string france = "40443"; //    final static string italy = "72825"; //    final static string usa = "72829";       public void start(stage stage) {          fxmlloader fxmlloader = new fxmlloader();         fxmlloader.setlocation(getclass().getresource("materialoverview.fxml"));         try {             anchorpane frame = fxmlloader.load();         } catch (ioexception e) {             e.printstacktrace();         }         materialoverviewcontroller c = fxmlloader.getcontroller();          //loads data table         c.setmainapp(mainapp);          stage.settitle("material on floor");         final categoryaxis xaxis = new categoryaxis();         final numberaxis yaxis = new numberaxis();         final barchart<string, number> bc =                 new barchart<string, number>(xaxis, yaxis);         bc.settitle("material on floor");         xaxis.setlabel("material");         yaxis.setlabel("quantity");           xychart.series series1 = new xychart.series();         series1.setname("6 inch");         integer floortotal = 0;           (material id :mainapp.getmaterialdata()) {             if (id.getmaterialwidth() < 6.9) {                 floortotal = id.getqtyonfloor();                 (material size : mainapp.getmaterialdata()) {                     if ( id.getmaterialid().equalsignorecase(size.getmaterialid()) &&                             size.getmaterialwidth() == id.getmaterialwidth()) {                         floortotal += size.getqtyonfloor();                     }                     else {                         floortotal = id.getqtyonfloor();                     }