import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.scene.shape.Rectangle; import javafx.stage.Stage; public class PlayerMovement extends Application { private static final int PLAYER_SIZE = 50; private static final int SCENE_WIDTH = 800; private static final int SCENE_HEIGHT = 600; private int playerX = SCENE_WIDTH / 2; private int playerY = SCENE_HEIGHT / 2; @Override public void start(Stage stage) { Rectangle player = new Rectangle(playerX, playerY, PLAYER_SIZE, PLAYER_SIZE); player.setFill(Color.BLUE); Group root = new Group(player); Scene scene = new Scene(root, SCENE_WIDTH, SCENE_HEIGHT); scene.setOnKeyPressed(e -> { switch (e.getCode()) { case UP: playerY -= 10; break; case DOWN: playerY += 10; break; case LEFT: playerX -= 10; break; case RIGHT: playerX += 10; break; } player.setX(playerX); player.setY(playerY); }); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(); } }In the above example, a rectangular player object is created and added to a group, which is then added to a scene. The scene is set to listen for key events (UP, DOWN, LEFT, RIGHT) and update the player's position accordingly. The player's X and Y coordinates are stored as instance variables and updated in the event handler before being set on the player object. The JavaFX package provides the necessary classes for creating and rendering graphics, as well as handling user input.