第三周课后作业

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发布于: 2020 年 06 月 21 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。
使用double check lock写法
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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。
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1、定义两个接口类型：View和ViewContainer
public interface View {
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    void print();
}
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public interface ViewContainer extends View {
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    void add(View... views);
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}
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2、为了实现组合，定义一个抽象类
public abstract class AbstractViewContainer implements ViewContainer {
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    private final List<View> viewList = new ArrayList<>();
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    @Override
    public void add(View... views) {
        if (Objects.nonNull(views)) {
            viewList.addAll(Arrays.asList(views));
        }
    }
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    @Override
    public void print() {
        viewList.forEach(View::print);
    }
}
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3、实现具体类
3.1、类继承关系
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3.2、具体代码
public class WinForm extends AbstractViewContainer {
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    private final String title;
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    public WinForm(String title) {
        this.title = title;
    }
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + title + ")");
        super.print();
    }
}
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public class Frame extends AbstractViewContainer {
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    private final String title;
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    public Frame(String title) {
        this.title = title;
    }
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + title + ")");
        super.print();
    }
}
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public class Button implements View {
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    private final String title;
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    public Button(String title) {
        this.title = title;
    }
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + title + ")");
    }
}
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public class CheckBox implements View {
    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(复选框)");
    }
}
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public class Label implements View {
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    private final String content;
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    public Label(String content) {
        this.content = content;
    }
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + content + ")");
    }
}
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public class LinkLabel extends Label {
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    public LinkLabel(String content) {
        super(content);
    }
}
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public class PasswordBox implements View {
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(密码框)");
    }
}
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public class Picture implements View {
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    private final String pictureName;
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    public Picture(String pictureName) {
        this.pictureName = pictureName;
    }
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + pictureName + ")");
    }
}
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public class TextBox implements View {
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    private final String title;
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    public TextBox(String title) {
        this.title = title;
    }
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    @Override
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + title + ")");
    }
}
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4、测试
public static void main(String[] args) {
        View forgetLabel = new LinkLabel("忘记密码");
        View rememberBox = new TextBox("记住密码");
        View checkBox = new CheckBox();
        View passwordBox = new PasswordBox();
        View passwordLabel = new Label("密码");
        View textBox = new TextBox("文本框");
        View usernameLabel = new Label("用户名");
        ViewContainer frame = new Frame("FRAME1");
        frame.add(usernameLabel, textBox, passwordLabel, passwordBox, checkBox, rememberBox, forgetLabel);
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        View picture = new Picture("LOGO图片");
        View signInButton = new Button("登录");
        View signUpButton = new Button("注册");
        ViewContainer winForm = new WinForm("WINDOW窗口");
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        winForm.add(picture, signInButton, signUpButton, frame);
        winForm.print();
    }
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发布于: 2020 年 06 月 21 日阅读数: 49
原文链接:【http://xie.infoq.cn/article/7123b62396f81f96050b030ea】。文章转载请联系作者。
iHai

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