java - JavaFX: TableView, ObservableList and updating TableColumn -

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i have following problem, i'm trying make gui input numbers , show in linechart , tableview. numbers on xaxis , left column weeks , numbers on yaxis , right column balances. it's supposed update balance if input same week twice. works out fine tableview. adds doesn't update values.

public class linechartsample extends application {     static final borderpane root = new borderpane();     static final hbox tabcha = new hbox();     static final gridpane texlab = new gridpane();     static final label woche = new label("woche: ");     static final textfield wochet = new textfield();     static final label kontostand = new label("kontostand: ");     static final textfield kontostandt = new textfield();     static final button hinzaend = new button("hinzufügen / Ändern");     static final button loeschen = new button("löschen");     static final label text = new label();     static final tableview<xychart.data<number, number>> table = new tableview<xychart.data<number, number>>();      public void start(stage stage) {         numberaxis xaxis = new numberaxis();         xaxis.setlabel("woche");         numberaxis yaxis = new numberaxis();         yaxis.setlabel("kontostand");         linechart<number, number> linechart = new linechart<number, number>(xaxis, yaxis);         linechart.settitle("kontostände 2014");          xychart.series<number, number> series1 = new xychart.series<number, number>();         series1.setname("konto 1");         linechart.getdata().add(series1);          tablecolumn<xychart.data<number, number>, number> woche = new tablecolumn<xychart.data<number,number>, number>("woche");         tablecolumn<xychart.data<number, number>, number> kontostand = new tablecolumn<xychart.data<number,number>, number>("kontostand");          woche.setcellvaluefactory(new propertyvaluefactory<xychart.data<number, number>, number>("xvalue"));         kontostand.setcellvaluefactory(new propertyvaluefactory<xychart.data<number, number>, number>("yvalue"));          woche.setsorttype(tablecolumn.sorttype.ascending);          table.setitems(series1.getdata());         table.getcolumns().add(woche);         table.getcolumns().add(kontostand);         table.getsortorder().add(woche);         tabcha.getchildren().addall(table, linechart);          texlab.add(woche, 0, 0);         texlab.add(wochet, 1, 0);         texlab.add(kontostand, 2, 0);         texlab.add(kontostandt, 3, 0);         texlab.add(hinzaend,4,0);         texlab.add(loeschen,0,1);         texlab.add(text, 0, 2, 4, 1);          hinzaend.setonaction(e -> {                 try {                     text.settext("");                     int index = 0;                     boolean vorhanden = false;                     (data<number, number> data: series1.getdata()) {                         if(data.getxvalue() == (number)integer.parseint(wochet.gettext())) {                             data.setyvalue(double.parsedouble(kontostandt.gettext()));                             series1.getdata().get(index).setyvalue(double.parsedouble(kontostandt.gettext()));;                             vorhanden = true;                         }                         index += 1;                         system.out.println(index);                     }                      if (!vorhanden) {                         series1.getdata().add(new xychart.data<number, number>(integer.parseint(wochet.gettext()), double.parsedouble(kontostandt.gettext())));                     }                     if (root.gettop() != tabcha) {                         root.settop(tabcha);                     }                     table.sort();                     system.out.println(series1.getdata());                 } catch (numberformatexception ex) {                     text.settext("falsche eingabe");                 }             });          loeschen.setonaction(e -> {                 text.settext("");                 try {                     (data<number, number> data: series1.getdata()) {                         if(data == table.getselectionmodel().getselecteditem()) {                             linechart.getdata().get(0).getdata().remove(data);                         }                         if(series1.getdata().isempty()) {                             root.getchildren().remove(tabcha);                         }                      }                     if (table.getselectionmodel().isempty()){                         text.settext("keine elemente selektiert");                     }                     if(series1.getdata().isempty()) {                         text.settext("keine elemente zum löschen vorhanden!");                         root.getchildren().remove(tabcha);                     }                   }catch (concurrentmodificationexception ex){                  }             });          root.setbottom(texlab);         scene scene = new scene(root, 800, 600);         stage.settitle("liniendiagramm");         stage.setscene(scene);         stage.show();     }      public static void main(string[] args) {         launch(args);     } }


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