javafx - How do I create KeyEvents in Java FXML? -

i created small project test key events. when press keys, isn't behaving want. need key events calculator project. created calculator project , aside mouse clicks, want add feature numbers or operators can typed keyboard. can check , make more functional?

public class fxmldocumentcontroller implements initializable{  @fxml private label label;  @fxml private button backspace;  @fxml private button spacebar;  @fxml private button enter;  @fxml void typedbs(keyevent event) {     if (event.getcode() == keycode.back_space) {         label.settext(event.gettext() + " typed.");     } }  @fxml void typede(keyevent event) {     if (event.getcode()==keycode.enter) {         label.settext(event.gettext() + " typed");     } }  @fxml void typedsb(keyevent event) {     if (event.getcode()==keycode.space) {         label.settext(event.gettext()+" typed");     } }  @fxml void pressbackspace(keyevent event) {     if (event.getcode() == keycode.back_space) {         label.settext("you pressed space key!");     } }  @fxml void clickbackspace(actionevent event) {     label.settext("you clicked space key!"); }  @fxml void clickenter(actionevent event) {     label.settext("you clicked enter key!"); }  @fxml void clickspacebar(actionevent event) {     label.settext("you clicked spacebar key!"); }  @fxml void pressenter(keyevent event) {     if (event.getcode() == keycode.enter) {         label.settext("you pressed enter key!");     } }  @fxml void pressspacebar(keyevent event) {     if (event.getcode() == keycode.space) {         label.settext("you pressed spacebar key!");     } }  @override public void initialize(url url, resourcebundle rb) {     // todo } 

}

if @ fxml file can see root node(the anchorpane) has onkeypressed , onkeyreleased.

<anchorpane id="anchorpane" onkeypressed="#handleonkeypressed" onkeyreleased="#handleonkeyreleased" prefheight="650.0" prefwidth="855.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atmfx.fxmldocumentcontroller">    <children>       <borderpane layoutx="263.0" layouty="94.0" prefheight="200.0" prefwidth="200.0" anchorpane.bottomanchor="0.0" anchorpane.leftanchor="0.0" anchorpane.rightanchor="0.0" anchorpane.topanchor="0.0">          <left>             <anchorpane fx:id="apleftdisplay" prefheight="200.0" prefwidth="200.0" borderpane.alignment="center">                <children> 

in controller method handles these 2 keyevents

@fxml private void handleonkeyreleased(keyevent event) {     system.out.println();     button tempbutton = buttons.get(event.gettext());     system.out.println("released key text: " + event.gettext());     system.out.println("released key code: " + event.getcode());      if (tempbutton != null) {         tempbutton.disarm();         tempbutton.setstyle("");     }     else if (event.getcode().equals(keycode.enter)) {         tempbutton = buttons.get("enter");         tempbutton.disarm();         tempbutton.setstyle("");     }     else if (event.getcode().equals(keycode.back_space)) {         tempbutton = buttons.get("backspace");         tempbutton.disarm();         tempbutton.setstyle("");     }     else if (event.getcode().equals(keycode.space)) {         tempbutton = buttons.get("space");         tempbutton.disarm();         tempbutton.setstyle("");     } }  @fxml private void handleonkeypressed(keyevent event) {     button tempbutton = buttons.get(event.gettext());     system.out.println("pressed key text: " + event.gettext());     system.out.println("pressed key code: " + event.getcode());     if (tempbutton != null) {         tempbutton.arm();         tempbutton.setstyle("-fx-background-color: blue");     }     else if (event.getcode().equals(keycode.enter)) {         tempbutton = buttons.get("enter");         tempbutton.arm();         tempbutton.setstyle("-fx-background-color: blue");     }     else if (event.getcode().equals(keycode.back_space)) {         tempbutton = buttons.get("backspace");         tempbutton.arm();         tempbutton.setstyle("-fx-background-color: blue");     }     else if (event.getcode().equals(keycode.space)) {         tempbutton = buttons.get("space");         tempbutton.arm();         tempbutton.setstyle("-fx-background-color: blue");     } } 

in code added of buttons hasmap. way in keyevent handlers able retrieve button depending on keyboard key pressed.

map<string, button> buttons = new hashmap<>(); thebuttonsparentnode.getchildren().stream().filter((tempnode)             -> (tempnode instanceof button)).map((             tempnode) -> (button) tempnode).foreachordered((tempbutton) -> {         buttons.put(tempbutton.gettext().tolowercase(), tempbutton);//adding button text , button hashmap     });