// 注意：这是伪代码 不能直接运行
class Component()
{
	public abstract Function draw();
}
class Picture implements Component()
{
	public Function draw() {
		print("LOGO图片");
	}
}
class Button implements Component()
{
	private text;
	public Function draw() {
		print(this.text + "按扭");
	}
	public setText(value) {
		text = value;
	}
}
class Label implements Component()
{
	private text;
	public Function draw() {
		print(this.text + "Label");
	}
	public setText(value) {
		text = value;
	}
}
class TextBox implements Component()
{
	public Function draw() {
		print("文本输入框");
	}
}
class PasswordBox implements Component()
{
	public Function draw() {
		print("密码输入框");
	}
}
class CheckBox implements Component()
{
	public Function draw() {
		print("复选输入框");
	}
}
class LinkDecorator implements Component()
{
	private Component element;
	public Function draw() {
		print("带Link的")
		element.draw();
	}
	public setElement(Component element) {
		this.element = element;
	}
}
class Window implements Component()
{
	private Array elements <Component>;
	public Function draw() {
		for (Component e: elements) {
			e.draw();
		}
	}
	public Function addElement(Component element) {
		elements.append(element);
	}
}
class Frame extends Window()
{
	public Function draw() {
		print("Frame 开始");
		upper.draw();
		print("Frame 结束");
	}
}
window = new Window();
picture = new Picture();
window.addElement(picture)
frame = new Frame();
window.addElement(frame);
userLabel = new Label();
userLabel.setText("用户名");
frame.addElement(userLabel);
frame.addElement(new TextBox());
pwdLabel = new Label();
pwdLabel.setText("密码")
frame.addElement(pwdLabel);
frame.addElement(new PasswordBox());
frame.addElement(new CheckBox());
rememberLabel = new Label();
rememberLabel.setText("记住用户名");
frame.addElement(rememberLabel);
forgetLabel = new Label();
forgetLabel.setText("记住用户名");
forgetLink = new LinkDecorator();
forgetLink.setElement(forgetLabel);
frame.addElement(forgetLink);
loginButton = new Button();
loginButton.setText("登录");
window.addElement(loginButton);
regButton = new Button();
regButton.setText("登录");
window.addElement(regButton)
window.draw();