JavaFX bounds issue? - javafx

Question

So, using JAVAfx, which I painfully downloaded, I need to be able to move this ball, but not let it leave the bounds. Right now, I have it all set up, it just leaves the area. What am i doing wrong? Any tutors don't know anything about JavaFX, so I'm having trouble getting past this. Right now I tried to work it out, but keep getting this error Cannot Make a Static Reference to Bound
'''
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.geometry.Bounds;
public class MoveBall extends Application {
// create buttons
Button left = new Button();
Button right = new Button();
Button up = new Button();
Button down = new Button();
Circle ball = new Circle(30, 30, 30);
// action event class
EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {
// handle them
#Override
public void handle(ActionEvent event) {
// movement of ball
if (event.getSource().equals(left) && ball.getLayoutX() >= (Bounds.getMaxX() + ball.getRadius())) {
ball.setCenterX(ball.getCenterX() - 5);
}
if (event.getSource().equals(right)) {
ball.setCenterX(ball.getCenterX() + 5);
}
if (event.getSource().equals(up)) {
ball.setCenterY(ball.getCenterY() - 5);
}
if (event.getSource().equals(down) && ball.getCenterY() < 400)) {
ball.setCenterY(ball.getCenterY() + 5);
}
}
};
// main method
public static void main(String[] args) {
Application.launch(args);
}
#Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Ball Movement");
ball.setStroke(Color.BLACK);
ball.setFill(null);
// button location
left.setLayoutX(100);
left.setLayoutY(210);
left.setText("Left");
// button event
left.setOnAction(event);
// similar for all button
right.setLayoutX(150);
right.setLayoutY(210);
right.setText("Right");
right.setOnAction(event);
// button location
up.setLayoutX(200);
up.setLayoutY(210);
up.setText("Up");
// button event
up.setOnAction(event);
// similar for all button
down.setLayoutX(250);
down.setLayoutY(210);
down.setText("Down");
down.setOnAction(event);
Group root = new Group();
// add to a group
root.getChildren().add(left);
root.getChildren().add(right);
root.getChildren().add(up);
root.getChildren().add(down);
root.getChildren().add(ball);
primaryStage.setScene(new Scene(root, 400, 250, Color.WHITE));
// show the scene
primaryStage.show();
}
}
'''