第 3 周 - 课后作业

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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。在草稿纸上手写双重检查锁实现单例模式。
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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 ﻿
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定义一个Module接口
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package com.ctec;
public interface Module {
    public  void print();
}
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定义一个含有子组件的抽象类：
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package com.ctec;
import java.util.ArrayList;
import java.util.List;
public abstract class CompositeModule implements  Module{
    private String name;
    private List<Module> moduleList = new ArrayList<>();
    public CompositeModule(String name) {
        this.name = name;
    }
    public CompositeModule add(Module module) {
        moduleList.add(module);
        return this;
    }
    @Override
    public void print() {
        System.out.println(String.format("print %s", name));
        for (Module module : moduleList) {
            module.print();
        }
    }
}
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package com.ctec;
public class WindowForm extends CompositeModule {
    public  WindowForm(String name) {
        super(name);
    }
}
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package com.ctec;
public class Button implements Module {
    private  String name;
    public Button(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println(String.format("print Button(%s)", name));
    }
}
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package com.ctec;
public class Picture implements Module {
    private  String path;
    public Picture(String path) {
        this.path = path;
    }
    @Override
    public void print() {
        System.out.println(String.format("print Picture(%s)", path));
    }
}
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package com.ctec;
public class Frame extends CompositeModule {
    public Frame(String name) {
        super(name);
    }
}
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package com.ctec;
public class Label implements Module {
    private String text;
    public Label(String text) {
        this.text = text;
    }
    @Override
    public void print() {
        System.out.println(String.format("print Label(%s)", text));
    }
}
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package com.ctec;
public class TextBox implements Module {
    private String placeHolder;
    public TextBox(String placeHolder) {
        this.placeHolder = placeHolder;
    }
    @Override
    public void print() {
        System.out.println(String.format("print TextBox(%s)", placeHolder));
    }
}
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package com.ctec;
public class PasswordBox implements Module {
    private String placeHolder;
    public PasswordBox(String placeHolder) {
        this.placeHolder = placeHolder;
    }
    @Override
    public void print() {
        System.out.println(String.format("print TextBox(%s)", placeHolder));
    }
}
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package com.ctec;
public class LinkLabel implements Module {
    private String text;
    public LinkLabel(String text) {
        this.text = text;
    }
    @Override
    public void print() {
        System.out.println(String.format("print LinkLabel(%s)", text));
    }
}
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package com.ctec;
public class CheckBox implements Module {
    @Override
    public void print() {
        System.out.println("print CheckBox(复选框)");
    }
}
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测试类
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package com.ctec;
import org.junit.Test;
import static org.junit.Assert.*;
public class ModuleTest {
    @Test
    public void print() {
        CompositeModule winForm = new WindowForm("WinForm(WINDOW窗口)");
        Module picture = new Picture("LOGO图片");
        Module loginButton = new Button("登录");
        Module registerButton = new Button("注册");
        CompositeModule frame = new Frame("Frame(FRAME1)");
        Module usernameLabel = new Label("用户名");
        Module usernameTextBox = new TextBox("请输入用户名");
        Module passwordLabel = new Label("密码");
        Module passwordBox = new PasswordBox("请输入密码");
        Module checkbox = new CheckBox();
        Module rememberTextBox = new TextBox("记住用户名");
        Module linkLabel = new LinkLabel("忘记密码");
        frame.add(usernameLabel).add(usernameTextBox).add(passwordLabel).add(passwordBox).add(checkbox).add(rememberTextBox).add(linkLabel);
        winForm.add(picture).add(loginButton).add(registerButton).add(frame).print();
    }
}
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测试输出结果
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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(请输入用户名)
print Label(密码)
print TextBox(请输入密码)
print CheckBox(复选框)
print TextBox(记住用户名)
print LinkLabel(忘记密码)
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