架构师训练营 - 作业 - 第三周

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发布于: 2020 年 06 月 23 日

请在草稿纸上手写一个单例模式的实现代码
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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。
组合模式定义
又叫部分-整体模式，是用于把一组相似的对象当作一个单一的对象。组合模式依据树形结构来组合对象，用来表示部分及整体层次。这种类型的设计模式属于结构性模式，它创建了对象组的树形结构。实现组合模式使得客户端对单个对象和组合对象的使用具有一致性。
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Wikipedia Definition
The composite pattern describes a group of objects that are treated as the same way as a single instance of the same type of the object. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Implementing the composite pattern lets clients treat individual objects and compositions uniformly.
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UML Class Diagram
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示例代码Interface - Component
Implementation - Control(Picture/Button/Label/TextBox/PasswordBox/CheckBox/LinkLabel)
Implementation - Container(WinForm/Frame)
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import java.util.ArrayList;
interface Component {
    public void print();
}
class Control implements Component {
    private String name;
    public Control(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print" + " " + this.name);
    }
}
class Container implements Component {
    private String name;
    private final ArrayList<Component> list = new ArrayList<>();
    public Container(String name) {
        this.name = name;
    }
    public void add(Component c) {
        list.add(c);
    }
    @Override
    public void print() {
        System.out.println("print" + " " + this.name);
        for (Component component : list) {
            component.print();
        }
    }
}
class PrintWinForm {
    public static void main(String[] args) {
        Container winForm = new Container("WinForm(WINDOW窗口)"); 
        Control picture = new Control("Picture(LOGO图片)");
        Control btnLogin = new Control("Button(登录)");
        Control btnReg = new Control("Button(注册))");        
        Container frame = new Container("Frame(FEAME1)");
        winForm.add(picture);
        winForm.add(btnLogin);
        winForm.add(btnReg);
        winForm.add(frame);
        Control lblUsername = new Control("Label(用户名)");
        Control txtUsername = new Control("TextBox(文本框)");
        Control lblPassword = new Control("Label(密码)");
        Control txtPassword = new Control("PasswordBox(密码框)");
        Control chkRememberPassword = new Control("CheckBox(复选框)");
        Control lblRememberPassword = new Control("TextBox(记住用户名)");
        Control lblForgotPassword = new Control("LinkLabel(忘记密码)");
        frame.add(lblUsername);
        frame.add(txtUsername);
        frame.add(lblPassword);
        frame.add(txtPassword);
        frame.add(chkRememberPassword);
        frame.add(lblRememberPassword);
        frame.add(lblForgotPassword);
        winForm.print();
    }
}
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Referencehttps://en.wikipedia.org/wiki/Composite_pattern
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