架构师训练营第 3 周作业

 关注

发布于: 2020 年 06 月 21 日

1. 请在草稿纸上手写一个单例模式的实现代码，拍照提交作业。分别写了饿汉式和懒汉式（双重验证支持线程安全，效率上会比直接在getInstance方法上加synchronized好些）
﻿
2. 请用组合设计模式编写程序，打印输出图 1 的窗口，窗口组件的树结构如图 2 所示，打印输出示例参考图 3。﻿
﻿
类图设计：
代码目录结构：
﻿
代码实现：
public interface UIComponent {
    void render();
}
public abstract class AbstractUIComponent implements UIComponent {
    protected String id;
    protected String name;
    public void render() {
        // 备注：题目要求只需打印一个具体UI组件的类型和名字即可，实际项目中render需要在各个UI组件子类中去实现
        System.out.println("print " + this.getClass().getSimpleName() + "(" + this.name + ")");
    }
}
public abstract class SingleUIComponent extends AbstractUIComponent {
}
public abstract class ContainerUIComponent extends AbstractUIComponent {
    private List<UIComponent> components = new ArrayList<UIComponent>();
    public void add(UIComponent component) {
        this.components.add(component);
    }
    public void remove(UIComponent component) {
        this.components.remove(component);
    }
    @Override
    public void render() {
        super.render();
        for (UIComponent component : this.components) {
            component.render();
        }
    }
}
public class Button extends SingleUIComponent {
    public Button(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class CheckBox extends SingleUIComponent {
    public CheckBox(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class Frame extends ContainerUIComponent {
    public Frame(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class Label extends SingleUIComponent {
    public Label(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class LinkLabel extends SingleUIComponent {
    public LinkLabel(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class PasswordBox extends SingleUIComponent {
    public PasswordBox(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class Picture extends SingleUIComponent {
    public Picture(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class TextBox extends SingleUIComponent {
    public TextBox(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class WinForm extends ContainerUIComponent {
    public WinForm(String id, String name) {
        this.id = id;
        this.name = name;
    }
}
public class UILauncher {
    public static void main(String[] args) {
        ContainerUIComponent winForm = new WinForm("winForm", "WINDOW窗口");
        winForm.add(new Picture("picLogo", "LOGO图片"));
        winForm.add(new Button("btnLogin", "登录"));
        winForm.add(new Button("btnRegister", "注册"));
        ContainerUIComponent frame = new Frame("frame1", "FRAME1");
        frame.add(new Label("labelUsername", "用户名"));
        frame.add(new TextBox("textBoxUsername", "文本框"));
        frame.add(new Label("labelPassword", "密码"));
        frame.add(new PasswordBox("passwordBox", "密码框"));
        frame.add(new CheckBox("checkBoxRemember", "复选框"));
        frame.add(new Label("labelRemember", "记住用户名"));
        frame.add(new LinkLabel("linkLabelForgot", "忘记密码"));
        winForm.add(frame);
        winForm.render();
    }
}
﻿
运行结果：
﻿