极客大学 - 架构师培训 -ch3 作业

关注

发布于: 2020 年 11 月 14 日

组件之间的类图设计
代码结构
代表性的类实现代码Component接口
/**
 * 组件接口
 */
public interface Component {
    // 渲染
    void render();
}
BaseComponent抽象类
public abstract class BaseComponent implements Component {
    private String name;
    public BaseComponent(String name) {
        this.name = name;
    }
    protected String getName() {
        return name;
    }
}
BaseContainer抽象类，编排了接口的render()方法
public abstract class BaseContainer extends BaseComponent {
    private List<Component> components;
    public BaseContainer(String name, List<Component> components) {
        super(name);
        this.components = CollectionUtils.isEmpty(components) ? Collections.emptyList() : components;
    }
    public void render() {
        renderSelf(); // 先render自己
        components.forEach(Component::render); // 再render自己的组件
    }
    // 由子类实现
    protected abstract void renderSelf();
}
WinForm实现类：
public class WinForm extends BaseContainer {
    public WinForm(String name, List<Component> components) {
        super(name, components);
    }
    @Override
    protected void renderSelf() {
        System.out.println("print WinForm(" + getName() + ")");
    }
}
TextBox和PasswordBox实现类（继承关系）：
public class TextBox extends BaseComponent {
    public TextBox(String name) {
        super(name);
    }
    @Override
    public void render() {
        System.out.println("print TextBox(" + getName() + ")");
    }
}
public class PasswordBox extends TextBox {
    public PasswordBox(String name) {
        super(name);
    }
    @Override
    public void render() {
        System.out.println("print PasswordBox(" + getName() + ")");
    }
}
结果测试直接调用WinForm对象的render()方法
public class Application {
    public static void main(String[] args) {
        createWinForm().render();
    }
    private static Component createWinForm() {
        // 创建WinForm的组件
        List<Component> winFormComponents = new ArrayList<>();
        winFormComponents.add(new Picture("LOGO图片"));
        winFormComponents.add(new Button("登录"));
        winFormComponents.add(new Button("注册"));
        winFormComponents.add(createFrame());
        // 创建WinForm
        return new WinForm("WINDOW窗口", winFormComponents);
    }
    private static Component createFrame() {
        // 创建frame组件
        List<Component> frameComponents = new ArrayList<>();
        frameComponents.add(new Label("用户名"));
        frameComponents.add(new TextBox("文本框"));
        frameComponents.add(new Label("密码"));
        frameComponents.add(new PasswordBox("密码框"));
        frameComponents.add(new CheckBox("复选框"));
        frameComponents.add(new TextBox("记住用户名"));
        frameComponents.add(new LinkLabel("忘记密码"));
        // 创建frame
        return new Frame("FRAME1", frameComponents);
    }
}
输出结果
﻿