构架师训练营 - 第 3 周命题作业

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发布于: 2020 年 06 月 24 日
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1 请手撕一个鬼子看看   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）
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各位看官，您没看错，今天的作业第一题就是手撕一个鬼子，来吧：
撕完了，原谅我，为了避免手撕带来的痛苦把这个类作得没心没肺，也没反抗行为！
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2 请用组合模式编写一个程序﻿
要求：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.
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直接上代码吧
BaseCtrl.jave
package cc.dawn.homework.winform.ctrl;
import java.io.PrintStream;
public abstract class BaseCtrl {
    public BaseCtrl(String name) {
        this.name = name;
    }
    /**
     * 标签名
     */
    private String name;
    /**
     * 获取类型
     * @return
     */
    public  String getType(){
        return this.getClass().getSimpleName();
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void print(PrintStream stream){
        stream.println(String.format("print %s(%s)",getType(), getName()));
    }
}
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2 Container 容器基类
package cc.dawn.homework.winform.container;
import cc.dawn.homework.winform.ctrl.BaseCtrl;
import cc.dawn.homework.winform.CtrlFactory;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
public class Container extends BaseCtrl {
    /**
     * 子节点
     */
    private List<BaseCtrl> children;
    public Container(String label) {
        super(label);
        this.children = new ArrayList<>();
    }
    public <T extends BaseCtrl> Container addChild(Class<T> instClass,String name){
        this.children.add(CtrlFactory.create(instClass,name));
        return this;
    }
    public <T extends BaseCtrl> Container addChild(BaseCtrl child){
        this.children.add(child);
        return this;
    }
    public List<BaseCtrl> getChildren() {
        return children;
    }
    public void setChildren(List<BaseCtrl> children) {
        this.children = children;
    }
    @Override
    public void print(PrintStream stream) {
        super.print(stream);
        if (children != null) {
            for (BaseCtrl baseCtrl : children) {
                baseCtrl.print(stream);
            }
        }
    }
}
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然后就是让Winform、Frame类继承Container容器类，Button、CheckBox、Lable、LinkLable等继承BaseCtrl，篇幅有限，仅以Winform、Button代码为例：
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WinForm.java
package cc.dawn.homework.winform.container;
public class WinForm extends Container {
    public WinForm(String label) {
        super(label);
    }
}
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Button.java
package cc.dawn.homework.winform.ctrl;
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public class Button extends BaseCtrl {
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    public Button(String label) {
        super(label);
    }
}
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为了方便测试我决定投资开个工厂
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CtrlFactory
package cc.dawn.homework.winform;
import cc.dawn.homework.winform.ctrl.BaseCtrl;
import java.lang.reflect.Constructor;
    public class CtrlFactory {
    public static <T extends BaseCtrl> T create(Class<T> instClass, String name) {
        try {
            Constructor<T> constructor = instClass.getConstructor(String.class);
            return constructor.newInstance(name);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
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TestWinForm
package cc.dawn.homework.winform.test;
import cc.dawn.homework.winform.CtrlFactory;
import cc.dawn.homework.winform.container.Frame;
import cc.dawn.homework.winform.container.WinForm;
import cc.dawn.homework.winform.ctrl.*;
public class TestWinForm {
    public static void main(String[] args) {
        CtrlFactory.create(WinForm.class, "WINDOW窗口")
                .addChild(Picture.class, "LOGO图片")
                .addChild(Button.class, "登录")
                .addChild(Button.class, "注册")
                .addChild(
                        CtrlFactory.create(Frame.class, "FRAME1")
                                .addChild(Lable.class, "用户名")
                                .addChild(TextBox.class, "文本框")
                                .addChild(Lable.class, "密码")
                                .addChild(PasswordBox.class, "密码框")
                                .addChild(CheckBox.class, "复选框")
                                .addChild(TextBox.class, "记住用户名")
                                .addChild(LinkLable.class, "忘记密码")
                ).print(System.out);
        ;
    }
}
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你们要的结果来了：
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