装饰器模式有哪些优点和缺点？

// 举例：窗口装饰器
interface Window {
    void draw();  // 绘制窗口
}

class SimpleWindow implements Window {
    @Override
    public void draw() {
        System.out.println("Drawing a simple window.");
    }
}

class WindowWithScrollBar implements Window {
    private Window window;

    public WindowWithScrollBar(Window window) {
        this.window = window;
    }

    @Override
    public void draw() {
        window.draw();
        System.out.println("Adding a scroll bar.");
    }
}

class WindowWithBorder implements Window {
    private Window window;

    public WindowWithBorder(Window window) {
        this.window = window;
    }

    @Override
    public void draw() {
        window.draw();
        System.out.println("Adding a border.");
    }
}

// 测试
public class DecoratorPatternTest {
    public static void main(String[] args) {
        Window simpleWindow = new SimpleWindow();
        simpleWindow.draw(); // 输出：Drawing a simple window.

        Window windowWithScrollBar = new WindowWithScrollBar(new SimpleWindow());
        windowWithScrollBar.draw(); // 输出：Drawing a simple window. Adding a scroll bar.

        Window windowWithBorder = new WindowWithBorder(new WindowWithScrollBar(new SimpleWindow()));
        windowWithBorder.draw(); // 输出：Drawing a simple window. Adding a scroll bar. Adding a border.
    }
}