第三周代码重构作业一

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发布于: 2020 年 10 月 04 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。
如图所示以静态内部类方式实现的单例模式
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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，打印输出示例参考图 3。
示例代码实现如下
/**
 * 抽象组件
 */
public abstract class Component {
    protected String name;
    public Component(String name) {
        this.name = name;
    }
    /**
     * 窗口输出
     */
    public abstract void print();
}
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import java.util.ArrayList;
import java.util.List;
/**
 * 抽象容器
 */
public abstract class Container extends Component {
    private List<Component> children;
    public Container(String name) {
        super(name);
    }
    public void add(Component child) {
        if (children == null) {
            children = new ArrayList<>();
        }
        children.add(child);
    }
    /**
     * 窗口输出容器
     */
    protected abstract void printSelf();
    @Override
    public void print() {
        printSelf();
        if (children != null) {
            children.forEach(Component::print);
        }
    }
}
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/**
 * window窗口
 */
public class WinForm extends Container {
    public WinForm(String name) {
        super(name);
    }
    @Override
    protected void printSelf() {
        System.out.println("print WinForm(" + name + ")");
    }
}
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/**
 * 带边框容器
 */
public class Frame extends Container {
    public Frame(String name) {
        super(name);
    }
    @Override
    protected void printSelf() {
        System.out.println("print Frame(" + name + ")");
    }
}
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/**
 * 图片
 */
public class Picture extends Component{
    public Picture(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print Picture(" + name + ")");
    }
}
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/**
 * 按钮
 */
public class Button extends Component{
    public Button(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print Button(" + name + ")");
    }
}
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public class Lable extends Component {
    public Lable(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print Label(" + name + ")");
    }
}
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/**
 * 文本框
 */
public class TextBox extends Component {
    public TextBox(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print TextBox(" + name + ")");
    }
}
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/**
 * 密码框
 */
public class PasswordBox extends Component {
    public PasswordBox(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print PasswordBox(" + name + ")");
    }
}
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/**
 * 复选框
 */
public class CheckBox extends Component{
    public CheckBox(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print CheckBox(" + name + ")");
    }
}
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/**
 * 链接
 */
public class LinkLable extends Component{
    public LinkLable(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println("print LinkLable(" + name + ")");
    }
}
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示例输出代码如下
public class Main {
    public static void main(String[] args) {
        WinForm winForm = createLoginForm();
        winForm.print();
    }
    
    private static WinForm createLoginForm() {
        WinForm winForm = new WinForm("WINDOW窗口");
        Picture logo = new Picture("LOGO图片");
        winForm.add(logo);
        Button loginBtn = new Button("登录");
        winForm.add(loginBtn);
        Button regBtn = new Button("注册");
        winForm.add(regBtn);
        Frame frame = new Frame("FRAME1");
        winForm.add(frame);
        Lable nameLable = new Lable("用户名");
        frame.add(nameLable);
        TextBox nameBox = new TextBox("文本框");
        frame.add(nameBox);
        Lable pwdLable = new Lable("密码");
        frame.add(pwdLable);
        PasswordBox pwdBox = new PasswordBox("密码框");
        frame.add(pwdBox);
        CheckBox rememberCb = new CheckBox("复选框");
        frame.add(rememberCb);
        TextBox rememberBox = new TextBox("记住用户名");
        frame.add(rememberBox);
        LinkLable linkLable = new LinkLable("忘记密码");
        frame.add(linkLable);
        
        return winForm;
    }
}
输出结果如下
print WinForm(WINDOW窗口)
print Picture(LOGO图片)
print Button(登录)
print Button(注册)
print Frame(FRAME1)
print Label(用户名)
print TextBox(文本框)
print Label(密码)
print PasswordBox(密码框)
print CheckBox(复选框)
print TextBox(记住用户名)
print LinkLable(忘记密码)
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