java - How to change background if I choose RadioButton and click Button -


i use javafx, new in javafx. app. if choose radiobutton have change background in other vbox. code.

hbox box2,box1; vbox  vbox1, vbox2; titledpane tp1,tp2;  stackpane stackpane,stackpane2  ;   radiobutton button1 ,button2,button3;  button dugme1, dugme2;  label labela1,labela2;  checkbox cek1,cek2,cek3,cek4; @override public void start(stage primarystage) {    hbox root = new hbox();      // stackpane     stackpane = new stackpane();     stackpane2 = new stackpane();       vbox1 = new vbox();     vbox1.setpadding(new insets(10, 10, 10, 10));     vbox1.setspacing(10);      vbox2 = new vbox();     vbox2.setpadding(new insets(10, 10, 10, 10));     vbox2.setspacing(10);        labela2 = new label("operativni sistemi");     vbox2.getchildren().add(labela2);     cek1 = new checkbox("windows");     vbox2.getchildren().add(cek1);      cek2 = new checkbox("linux");     vbox2.getchildren().add(cek2);      cek3 = new checkbox("ios");     vbox2.getchildren().add(cek3);      cek4 = new checkbox("android");     vbox2.getchildren().add(cek4);     dugme2 = new button("klikni");     vbox2.getchildren().add(dugme2);

these radiobutton .

 labela1 = new label("boje");      vbox1.getchildren().add(labela1);     button1 = new radiobutton("crvena");     vbox1.getchildren().add(button1);     button2 = new radiobutton("plava");     vbox1.getchildren().add(button2);     button3 = new radiobutton("bela");     vbox1.getchildren().add(button3);     dugme1 = new button("klikni");     vbox1.getchildren().add(dugme1);      stackpane.getchildren().add(vbox1);

and have in vbox2 change background if choose radiobutton.

stackpane2.getchildren().add(vbox2);      stackpane.setprefsize(150, 150);     stackpane.setstyle("-fx-background-color: gainsboro;-fx-border-color: `blue;");`     stackpane2.setprefsize(300, 150);     stackpane2.setstyle("-fx-background-color: gainsboro;-fx-border-color: `blue;");`        root.getchildren().add(stackpane);      button controlbutton = new button("change top");      root.getchildren().add(stackpane2);     root.setalignment(pos.center);     vbox.setmargin(stackpane, new insets(10, 10, 10, 10));     vbox.setmargin(controlbutton, new insets(10, 10, 10, 10));      scene scene = new scene(root, 550, 250);      primarystage.settitle("dusan petrovic");     primarystage.setscene(scene);      controlbutton.setonaction(new eventhandler<actionevent>() {          @override         public void handle(actionevent event) {             changetop();         }      });   primarystage.show(); }  private void changetop() {     observablelist<node> childs = this.stackpane.getchildren();      if (childs.size() > 1) {         //         node topnode = childs.get(childs.size()-1);         topnode.toback();     } }   public static void main(string[] args) {


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