JavaFX Scene builder - more objects without Scene builder - javafx

Question

I created a GUI in Scenebuilder. 2 rectangles. A circle should be displayed for a KeyEvent. The circle is not displayed (playShoot()). Can objects be inserted without Scenebuilder? I think yes, but how? Do you have an idea?
Controller Class
public class PlayAnonymController{
#FXML
private Rectangle PLAYER;
#FXML
private Label gamoverLabel;
#FXML
private Label scoreLabel;
//Variablen
public enum Direction {
LEFT, RIGHT, SPACE, NONE
}
double cX;
public static List<Circle> bullets = new ArrayList<>();
#FXML
public void movePlayer(KeyEvent event) throws IOException{
KeyCode key = event.getCode(); // keyboard code for the pressed key
// System.out.println("Key Pressed: " + key); // for testing
switch (event.getCode()) {
case LEFT:
moveLeft();
break;
case RIGHT:
moveRight();
break;
case SPACE:
playerShoot();
break;
}
}
public void playerShoot() {
System.out.println("Test");
Circle circle = new Circle(50, 50, 50);
circle.setFill(Color.RED);
}
void moveLeft() {
PLAYER.setTranslateX(cX-=10);
}
void moveRight() {
PLAYER.setTranslateX(cX+=10);
}
}
My FXML file from Scenebuilder. At the bottom of the circle should be visible after a KeyEvent.
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.shape.Rectangle?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.PlayAnonymController">
<top>
<BorderPane prefHeight="37.0" prefWidth="600.0" BorderPane.alignment="CENTER">
<left>
<Label fx:id="scoreLabel" text="Label" BorderPane.alignment="CENTER" />
</left>
<center>
<Label fx:id="gamoverLabel" text="Label" BorderPane.alignment="CENTER" />
</center>
</BorderPane>
</top>
<bottom>
<Label text="Move: Pfeiltaste links / recht. Schießen Space." BorderPane.alignment="CENTER" />
</bottom>
<center>
<Pane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<children>
<Rectangle fx:id="PLAYER" arcHeight="5.0" arcWidth="5.0" fill="#000911" height="5.0" layoutX="280.0" layoutY="305.0" onKeyPressed="#movePlayer" stroke="BLACK" strokeType="INSIDE" width="40.0" />
</children>
</Pane>
</center>
</BorderPane>