设计模式代码实现

关注

发布于: 2020 年 06 月 23 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。﻿
﻿
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：使用组合设计模式实现
﻿
﻿
代码实现：主要类，View.java, ViewManager.java, ViewGroup.java, Button.java, WinForm.java等
﻿
//View.java
public class View {
    protected String title;
    public void draw() {
        // prepare ...
        onDraw();
    }
    protected void onDraw() {
        // ...
    }
}
﻿
//ViewManager.java
public interface ViewManager {
    /**
     * children view manager
     */
    void addView(View view);
    void removeView(View view);
    View getChildren(int index);
}
﻿
//ViewGroup.java
public class ViewGroup extends View implements ViewManager {
    private ArrayList<View> mChildren = new ArrayList<>(16);
    
    @Override
    public void addView(View view) {
        mChildren.add(view);
    }
    @Override
    public void removeView(View view) {
        mChildren.remove(view);
    }
    @Override
    public View getChildren(int index) {
        return mChildren.get(index);
    }
    @Override
    protected void onDraw() {
        super.onDraw();
        for (View view : mChildren) {
            view.draw();
        }
    }
}
﻿
//各种控件组件(类似):Button.java, CheckBox.java, Label.java, LinkLabel.java, //PasswordBox.java, Picture.java, TextBox.java
public class Button extends View {
    public Button(String title) {
        this.title = title;
    }
    @Override
    protected void onDraw() {
        super.onDraw();
        System.out.println(getClass().getSimpleName() + "(" + title + ")");
    }
}
﻿
//容器组件：WinForm.java, Frame.java
public class WinForm extends ViewGroup {
    public WinForm(String title) {
        this.title = title;
    }
    @Override
    protected void onDraw() {
        System.out.println(getClass().getSimpleName() + "(" + title + ")");
        super.onDraw();
    }
}
﻿
 //客户端程序
public class ViewTest {
    public static void main(String[] args) {
        ViewGroup winForm = new WinForm("WINDOW窗口");
        winForm.addView(new Picture("LOGO图片"));
        ViewGroup frame = new Frame("FRAME1");
        frame.addView(new Label("用户名"));
        frame.addView(new TextBox("文本框"));
        frame.addView(new Label("密码"));
        frame.addView(new PasswordBox("密码"));
        frame.addView(new CheckBox("复选框"));
        frame.addView(new TextBox("记住用户名"));
        frame.addView(new LinkLabel("忘记密码"));
        winForm.addView(frame);
        winForm.addView(new Button("登录"));
        winForm.addView(new Button("注册"));
        winForm.draw();
    }
}
﻿
运行结果
WinForm(WINDOW窗口)
Picture(LOGO图片)
Frame(FRAME1)
Label(用户名)
TextBox(文本框)
Label(密码)
PasswordBox(密码)
CheckBox(复选框)
TextBox(记住用户名)
LinkLabel(忘记密码)
Button(登录)
Button(注册)
﻿