使用箭头键移动圆-Java

Question

我现在正在实验JavaFX，教自己如何使用箭头键移动文本和项。我做了一个程序，如果按下箭头键，就可以简单地在舞台上移动文本。

我想使一个圆圈移动我的窗格，而不是文本。要使用箭头键移动我的圆圈，我必须做哪些更改？

public void start(Stage primaryStage) {
        Pane pane = new Pane();

        int dx = 50;
        int dy = 50;
        int radius = 125;

        Circle circle = new Circle(radius,dx,dy);
        Text text = new Text(20,20,"HI");
        circle.setFill(Color.WHITE);
        circle.setStroke(Color.BLACK);

        pane.getChildren().addAll(circle, text);

        circle.setOnKeyPressed(e -> {
            switch(e.getCode()) {
            case DOWN: text.setY(text.getY() + 10);
            break;
            case UP: text.setY(text.getY() - 10);
            break;
            case LEFT: text.setX(text.getX() - 10);
            break;
            case RIGHT: text.setX(text.getX() + 10);
            break;
            default:
                if(Character.isLetterOrDigit(e.getText().charAt(0)))
                    text.setText(e.getText());
            break;      
            }
        });

        Scene scene = new Scene(pane, 250, 200);
        primaryStage.setTitle("Arrow Keys");
        primaryStage.setScene(scene);
        primaryStage.show();

        text.requestFocus();
    }

Answer 1

scene.setOnKeyPressed(e -> {
    switch (e.getCode()) {
    case DOWN:
        circle.setCenterY(circle.getCenterY() + 10);
        break;
    case UP:
        circle.setCenterY(circle.getCenterY() - 10);
        break;
    case LEFT:
        circle.setCenterX(circle.getCenterX() - 10);
        break;
    case RIGHT:
        circle.setCenterX(circle.getCenterX() + 10);
        break;
    }
});