java - Items not showing in TableView in JavaFX -

i have table view pintable in fxmland 2 table columns i.e. latcolumn, longcolumn. have followed following method populate table :

https://docs.oracle.com/javafx/2/ui_controls/table-view.htm

snippets follows:

fxml controller class:

@fxml public tableview pintable; @fxml public tablecolumn latcolumn, longcolumn;  public final observablelist<pinlist> datasource = new fxmlcollections.observablearraylist();  @override public void initialize(url url, resourcebundle rb) {     inittable(); }  private void inittable() {     latcolumn.setcellvaluefactory(new propertyvaluefactory<pinlist,string>("latpin"));     longcolumn.setcellvaluefactory(new propertyvaluefactory<pinlist,string>("longpin"));      pintable.setitems(datasource); }  @fxml private void addbuttonclicked(mouseevent event) {     if(lattext.gettext().equals(""))     {         system.out.println("lat empty");     }     else if(longtext.gettext().equals(""))     {         system.out.println("long empty");     }     else     {         latval = double.parsedouble(lattext.gettext());         longval = double.parsedouble(longtext.gettext());          datasource.add(new pinlist(lattext.gettext(),longtext.gettext(),descriptiontext.gettext()));          pintable.getitems().clear();         pintable.getitems().addall(datasource);          for(pinlist p: datasource)         {             system.out.print(p.getlatpin() + " " + p.getlongpin() + " " + p.getdescriptionpin() + "\n");         }     } } 

i have pinlist class follows:

public class pinlist  {     private final simplestringproperty latpin;     private final simplestringproperty longpin;     private string descriptionpin;      public pinlist(string _latpin, string _longpin, string _descriptionpin)     {         this.latpin = new simplestringproperty(_latpin);         this.longpin = new simplestringproperty(_longpin);         this.descriptionpin = _descriptionpin;     }      public string getlatpin()     {         return latpin.getvalue();     }     public stringproperty latpinproperty()     {         return latpin;     }       public string getlongpin()     {         return longpin.getvalue();     }     public stringproperty longpinproperty()     {         return longpin;     }       public string getdescriptionpin()     {         return descriptionpin;     } } 

all these seem fine. but, when click add button, nothing happens. no row created in table , println inside addbuttonclicked event handler doesn't execute, or executed no data in datasource whatsoever. appreciated.

in inittable() method do

pintable.setitems(datasource); 

so list held internally pintable in items property same list datasource (they identical reference).

now in event handler method do

datasource.add(new pinlist(...)); 

which adds new item datasource (which same list table's items)

and then

pintable.getitems().clear(); 

which removes elements table's items list. table's items list empty (has no elements). of course, since same list datasource, have removed items datasource: same (now empty) list pintable.getitems().

and do

pintable.getitems().addall(datasource); 

which copies items in datasource (there none) pintable.getitems() (which same list). duplicates items in list, since emptied list, still have empty list.

just remove lines

pintable.getitems().clear(); pintable.getitems().addall(datasource); 

all want here is:

@fxml private void addbuttonclicked(mouseevent event)  {     if(lattext.gettext().equals(""))     {         system.out.println("lat empty");     }     else if(longtext.gettext().equals(""))     {         system.out.println("long empty");     }     else     {         latval = double.parsedouble(lattext.gettext());         longval = double.parsedouble(longtext.gettext());          datasource.add(new pinlist(lattext.gettext(),longtext.gettext(),descriptiontext.gettext()));          for(pinlist p: datasource)         {             system.out.print(p.getlatpin() + " " + p.getlongpin() + " " + p.getdescriptionpin() + "\n");         }     } }