javafx 2 - Hot to update dynamically font size -

i have css file sets default font size , type in javafx application:

.root {   -fx-font: 13px tahoma; }  scene.getstylesheets().add(getclass().getresource("/styles/styles.css").toexternalform()); 

i want update size , font type java code dynamically of root component (all components). how can this?

note: code updates font type , size of components javafx application.

please consider taking @ official javafx documentation. there find code example answers question:

text t = new text("that's text"); t.setfont(font.font ("verdana", 20)); 

update

in application controller instance of root pane, e.g. anchorpane , use setid("") function set new style whole pane (my actionchange connected button on pane, triggers event/change):

public class appcontroller implements initializable {     @fxml     private anchorpane mainpane;      @override     public void initialize(url arg0, resourcebundle arg1) {         // todo auto-generated method stub     }      @fxml     public void actionchange() {         mainpane.setid("fancytext");     } } 

when pressing button, style pane changed. used font-size example. before, need specify new style in css file:

.root {     -fx-font: 12px tahoma; }  #fancytext {     -fx-font: 20px tahoma; } 

that's before:

that's after button pressed: