架构师训练营第 1 期第 3 周作业

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发布于: 2020 年 09 月 29 日

1. 请在草稿纸上手写一个单例模式的实现代码。﻿
解：
方式1：预加载模式：
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方式2：懒加载模式：
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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。
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解：
类图如下：
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Component接口：
public interface Component {
    public void add(Component c);
    public void remove(Component c);
    public Component getChild(int i);
    public void operation();
}
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Composite实现类：
package org.luchengye.combo;
import java.util.ArrayList;
public class Composite implements Component{
    private ArrayList<Component> children = new ArrayList<Component>();
    private String name;
    public Composite(String name) {
        this.name = name;
    }
    @Override
    public void add(Component c) {
        children.add(c);
    }
    @Override
    public void remove(Component c) {
        children.remove(c);
    }
    @Override
    public Component getChild(int i) {
        return children.get(i);
    }
    @Override
    public void operation() {
        System.out.println("print "+name);
        for (Object obj : children) {
            ((Component) obj).operation();
        }
    }
}
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Leaf实现类：
package org.luchengye.combo;
public class Leaf implements Component{
    private String name;
    public Leaf(String name) {
        this.name = name;
    }
    @Override
    public void add(Component c) {
    }
    @Override
    public void remove(Component c) {
    }
    @Override
    public Component getChild(int i) {
        return null;
    }
    @Override
    public void operation() {
        System.out.println("print "+name);
    }
}
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Client主程序：
package org.luchengye.combo;
public class Client {
    public static void main(String[] args) {
        Component component=new Composite("WinFrom(WINDOW窗口)");
        component.add(new Leaf("Picture(LOGO图片)"));
        component.add(new Leaf("Button(登录)"));
        component.add(new Leaf("Button(注册)"));
        Component frame=new Composite("Frame(FRAME1)");
        frame.add(new Leaf("Lable(用户名)"));
        frame.add(new Leaf("TextBox(文本框)"));
        frame.add(new Leaf("Lable(密码)"));
        frame.add(new Leaf("PasswordBox(密码框)"));
        frame.add(new Leaf("CheckBox(复选框)"));
        frame.add(new Leaf("TextBox(记住用户名)"));
        frame.add(new Leaf("LinkLable(忘记密码)"));
        component.add(frame);
        component.operation();
    }
}
输出结果：
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