java - Javafx - How to Add Pie Chart to BorderPane from Different Class -

i have 2 classes. main class , chart class. chart class extends piechart , instantiates pie chart in constructor. main class creates borderpane, instantiate object of chart class(creating pie chart) , add center pane.the problem don't know exact syntax make work properly, in constructor of chart class.

i know example, if creating hbox instead of pie chart in constructor, use this. , number of methods. pie charts have additional elements observable lists i'm not sure how make work? here 2 classes below. please help. thank you.

main class

public class main extends application { @override public void start(stage primarystage) {     borderpane border = new borderpane();      chart chart = new chart();      border.setcenter(chart);      scene scene = new scene (border, 640,680);     primarystage.setscene(scene);     primarystage.show();  } public static void main(string[] args) {     launch(args); }} 

chart class

public class chart extends piechart{  public chart(){     observablelist<piechart.data>piechart = fxcollections.observablearraylist(             new piechart.data("fruits", 75),             new piechart.data("vegetables", 25)             );      piechart chart = new piechart(piechart);      //what code can create pie chart here? solution place chart on it's own pane instead? }} 

you looking

public chart(){     observablelist<piechart.data>piechart = fxcollections.observablearraylist(             new piechart.data("fruits", 75),             new piechart.data("vegetables", 25)             );     setdata(piechart);     // no need -> piechart chart = new piechart(piechart); } 

or

public chart(){    super(fxcollections.observablearraylist(          new piechart.data("fruits", 75),          new piechart.data("vegetables", 25)    )); } 

edit after comment: setdata(observablelist data) method piechart class. , set data objects. easy , convenient way work data in chart or other collection powered view. (yep, not chart-only style. pretty same javafx views. chart listen data changes , redraw internaly.you need set data you'd display. in case have method because chart extends piechart

when piechart charts = new piechart(data); in piechart call setdata internaly

public piechart(observablelist<piechart.data> data){    setdata(data);    ... } 

so that's why have call super(data) or setdata(data) in extended class. if want chage charts, don't have recreate whole chart every time. can change data charts.setdata(somedata) or data list object charts.getdata() , change it.

for example:

piechart charts = new piechart(); observablelist<piechart.data> piechart = ... charts.setdata(piechart); // piechart == charts.getdata() // same object. pinechart.add(new piechart.data("new fruit", 75)) // change chart 

btw, take @ tutorials https://docs.oracle.com/javafx/2/charts/jfxpub-charts.htm