package com.example.week3;

import java.util.ArrayList;
import java.util.List;

public class Component {

    private String type;

    private List<Component> subComponents;

    public Component(String type) {
        this.type = type;
    }

    public void draw() {
        System.out.println(type);
        if (subComponents != null && subComponents.size() > 0) {
            for (Component subComponent : subComponents) {
                subComponent.draw();
            }
        }
    }

    public void addComponent(Component component) {
        if (subComponents == null) {
            subComponents = new ArrayList<>();
        }
        subComponents.add(component);
    }

    public void addComponents(List<Component> components) {
        if (subComponents == null) {
            subComponents = new ArrayList<>();
        }
        subComponents.addAll(components);
    }
}


package com.example.week3;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Main {

    public static void main(String[] args) {
        Component label = new Component("label[username]");
        Component textBox = new Component("text box");
        Component labelPwd = new Component("label[password]");
        Component pwdBox = new Component("PasswordBox");
        Component checkBox = new Component("CheckBox");
        Component textBoxRememberUsername = new Component("TextBox");
        Component linkTable = new Component("LinkTable");

        List<Component> componentList = new ArrayList<>();
        componentList.add(label);
        componentList.add(textBox);
        componentList.add(labelPwd);
        componentList.add(pwdBox);
        componentList.add(checkBox);
        componentList.add(textBoxRememberUsername);
        componentList.add(linkTable);

        Component frame = new Component("frame");
        frame.addComponents(componentList);

        Component picture = new Component("picture");
        Component button = new Component("button");
        Component button2 = new Component("button register");

        List<Component> formComponents = Arrays.asList(picture, button, button2, frame);

        Component form = new Component("form");
        form.addComponents(formComponents);

        form.draw();
    }
}