// 接口
public interface Component {
  public void draw();
}
// 容器类
import java.util.ArrayList;
import java.util.List;
public class BasicComponent implements Component {
  private String name;
  private List<Component> subComponent = new ArrayList<>();
  public BasicComponent(String name) {
    this.name = name;
  }
  public void addSubComponent(Component sub) {
    subComponent.add(sub);
  }
  @Override
  public void draw() {
    System.out.println("print " + name);
    for (Component c : subComponent) {
      c.draw();
    }
  }
}
// 主函数
public class Application {
  public static void main(String[] args) {
    BasicComponent winForm = new BasicComponent("WinForm(Windows 窗口)");
    Component picture = new BasicComponent("Picture(Logo  图片)");
    Component btnLogin = new BasicComponent("Button(登录)");
    Component btnReg = new BasicComponent("Button(注册)");
    BasicComponent frameLoginWrapper = new BasicComponent("Frame(Frame1)");
    Component lblUsername = new BasicComponent("Label(用户名)");
    Component txtUsername = new BasicComponent("TextBox(文本框)");
    Component lblPassword = new BasicComponent("Label(密码)");
    Component txtPassword = new BasicComponent("PasswordBox(密码框)");
    Component checkRemember = new BasicComponent("CheckBox(复选框)");
    Component lblRemember = new BasicComponent("TextBox(记住用户名,应该是个 Label?)");
    Component linkLabelRemember = new BasicComponent("linkLabel(忘记密码)");
    frameLoginWrapper.addSubComponent(lblUsername);
    frameLoginWrapper.addSubComponent(txtUsername);
    frameLoginWrapper.addSubComponent(lblPassword);
    frameLoginWrapper.addSubComponent(txtPassword);
    frameLoginWrapper.addSubComponent(checkRemember);
    frameLoginWrapper.addSubComponent(lblRemember);
    frameLoginWrapper.addSubComponent(linkLabelRemember);
    winForm.addSubComponent(picture);
    winForm.addSubComponent(btnLogin);
    winForm.addSubComponent(btnReg);
    winForm.addSubComponent(frameLoginWrapper);
    winForm.draw();
  }
}