代码重构练习三

public interface Component {
    void print();
    void add(Component component);
}

public class RootNode implements Component {
    private List<Component> childComponents = new ArrayList<Component>();
    public RootNode(String name) {
        this.name = name;
    }
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println(name);
        if(this.childComponents != null && this.childComponents.size() > 0){
            childComponents.stream().forEach(child ->{
                child.print();
            });
        }
    }
    @Override
    public void add(Component component) {
        childComponents.add(component);
    }
}

public class LeafNode implements Component {
    private String name;
    public LeafNode(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println(name);
    }
    @Override
    public void add(Component component) {
    }
}

public class Client {
    public static void main(String[] args) {
        Component root = new RootNode("WINDOW窗口");
        root.add(new LeafNode("LOGO图片"));
        root.add(new LeafNode("登录"));
        root.add(new LeafNode("注册"));
        Component frameNode = new RootNode("FRAME1");
        frameNode.add(new LeafNode("用户名"));
        frameNode.add(new LeafNode("文本框"));
        frameNode.add(new LeafNode("密码"));
        frameNode.add(new LeafNode("密码框"));
        frameNode.add(new LeafNode("复选框"));
        frameNode.add(new LeafNode("记住用户名"));
        frameNode.add(new LeafNode("忘记密码"));
        root.add(frameNode);
        root.print();
    }
}

WINDOW窗口
LOGO图片
登录
注册
FRAME1
用户名
文本框
密码
密码框
复选框
记住用户名
忘记密码