在Slick2D中如何让角色在松开按键后继续移动？

public class Player {
    private boolean isMoving = false;
    private float x, y;
    private float speed = 0.1f;

    public void update(GameContainer gc, int delta) {
        if (isMoving) {
            // 继续移动角色的逻辑
            x += speed * delta;
        }
    }

    public void keyPressed(int key, char c) {
        if (key == Input.KEY_RIGHT) {
            isMoving = true;
        }
    }

    public void keyReleased(int key, char c) {
        if (key == Input.KEY_RIGHT) {
            isMoving = false;
        }
    }
}

public class Game extends BasicGame {
    private Player player;

    public void init(GameContainer gc) throws SlickException {
        player = new Player();
        gc.getInput().addKeyListener(player);
    }

    public void update(GameContainer gc, int delta) throws SlickException {
        player.update(gc, delta);
    }
}