系统中的文本显示类（TextView）和图片显示类（PictureView）都继承了组件类（Component），分别显示文本和图片内容，现需要构造带有滚动条、或者带有黑色边框、或者既有滚动条又有黑色边框的文本显示控件和图片显示控件，但希望最多只增加三个类，

可以采用装饰器模式来实现这个需求。具体地，我们可以定义一个装饰器类（Decorator），用于装饰文本显示类和图片显示类，实现滚动条和黑色边框的功能。具体实现如下：

- 定义组件类（Component），其中包含了显示组件的基本方法display()。

public abstract class Component {
    public abstract void display();
}

- 定义文本显示类（TextView），继承自组件类，实现文本内容的显示。

public class TextView extends Component {
    private String content;
    
    public TextView(String content) {
        this.content = content;
    }
    
    public void display() {
        System.out.println(content);
    }
}

- 定义图片显示类（PictureView），继承自组件类，实现图片内容的显示。

public class PictureView extends Component {
    private String fileName;
    
    public PictureView(String fileName) {
        this.fileName = fileName;
    }
    
    public void display() {
        System.out.println("Displaying picture " + fileName);
    }
}

- 定义装饰器类（Decorator），继承自组件类，用于实现装饰功能。

public class Decorator extends Component {
    private Component component;
    
    public Decorator(Component component) {
        this.component = component;
    }
    
    public void display() {
        component.display();
    }
}

- 定义滚动条装饰器类（ScrollBarDecorator），继承自装饰器类，实现滚动条的功能。

public class ScrollBarDecorator extends Decorator {
    public ScrollBarDecorator(Component component) {
        super(component);
    }
    
    public void display() {
        super.display();
        System.out.println("Adding scrollbar...");
    }
}

- 定义黑色边框装饰器类（BlackBorderDecorator），继承自装饰器类，实现黑色边框的功能。

public class BlackBorderDecorator extends Decorator {
    public BlackBorderDecorator(Component component) {
        super(component);
    }
    
    public void display() {
        super.display();
        System.out.println("Adding black border...");
    }
}

- 定义滚动条和黑色边框装饰器类（ScrollBarAndBlackBorderDecorator），继承自装饰器类，实现既有滚动条又有黑色边框的功能。

public class ScrollBarAndBlackBorderDecorator extends Decorator {
    public ScrollBarAndBlackBorderDecorator(Component component) {
        super(component);
    }
    
    public void display() {
        super.display();
        System.out.println("Adding scrollbar and black border...");
    }
}

使用示例：

Component textView = new TextView("This is a text view.");
Component pictureView = new PictureView("picture.jpg");

Component textViewWithScrollBar = new ScrollBarDecorator(textView);
Component textViewWithBlackBorder = new BlackBorderDecorator(textView);
Component textViewWithScrollBarAndBlackBorder = new ScrollBarAndBlackBorderDecorator(textView);

Component pictureViewWithScrollBar = new ScrollBarDecorator(pictureView);
Component pictureViewWithBlackBorder = new BlackBorderDecorator(pictureView);
Component pictureViewWithScrollBarAndBlackBorder = new ScrollBarAndBlackBorderDecorator(pictureView);

textViewWithScrollBar.display();
textViewWithBlackBorder.display();
textViewWithScrollBarAndBlackBorder.display();

pictureViewWithScrollBar.display();
pictureViewWithBlackBorder.display();
pictureViewWithScrollBarAndBlackBorder.display();

输出结果：

This is a text view.
Adding scrollbar...
This is a text view.
Adding black border...
This is a text view.
Adding scrollbar and black border...
Displaying picture picture.jpg
Adding scrollbar...
Displaying picture picture.jpg
Adding black border...
Displaying picture picture.jpg
Adding scrollbar and black border...