//Subject
abstract class Graphic {
    protected String fileName;

    abstract void draw();

    public String getFileName() {
        return fileName;
    }
}

//RealSubject
class Image extends Graphic {

    public Image(String fileName) {
        this.fileName = fileName;
    }

    //Request()
    public void draw() {
        System.out.println("draw " + fileName);
    }
}

//Proxy
class ImageProxy extends Graphic {
    private Image image;

    public ImageProxy(String fileName) {
        this.fileName = fileName;
    }

    public void draw() {
        getImage().draw();
    }

    private Image getImage() {
        if (image == null) {
            image = new Image(fileName);
        }
        return image;
    }
}

//Client
var proxy = new ImageProxy("1.png");
//operation without creating a RealSubject
var fileName = proxy.getFileName();
//forwarded to the RealSubject
proxy.draw();

System.out.println(fileName);