Week3 作业

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发布于: 2020 年 06 月 21 日

作业一：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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作业二：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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类图：
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Component.java 文件：（为了简便，所有接口和实现类都写在该文件中）
package com.xql.arch.week3;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
public interface Component {
    void print(PrintWriter printWriter);
}
interface ContainerComponent extends Component {
    ContainerComponent addChildren(List<Component> children);
}
abstract class NamedComponent implements Component {
    private String name;
    public NamedComponent(String name) {
        this.name = name;
    }
    @Override
    public void print(PrintWriter printWriter) {
        printWriter.println("print " + getClass().getSimpleName() + "(" + this.getName() + ")");
    }
    public String getName() {
        return this.name;
    }
}
abstract class NamedContainerComponent extends NamedComponent implements ContainerComponent {
    private List<Component> children;
    public NamedContainerComponent(String name) {
        super(name);
        this.children = new LinkedList<>();
    }
    public Component addChildren(Component... children) {
        return this.addChildren(Arrays.asList(children));
    }
    @Override
    public ContainerComponent addChildren(List<Component> children) {
        assert children != null;
        this.children.addAll(children);
        return this;
    }
    @Override
    public void print(PrintWriter printWriter) {
        super.print(printWriter);
        this.children.forEach(component -> component.print(printWriter));
    }
}
class WinForm extends NamedContainerComponent {
    public WinForm(String name) {
        super(name);
    }
}
class Frame extends NamedContainerComponent {
    public Frame(String name) {
        super(name);
    }
}
class Picture extends NamedComponent {
    public Picture(String name) {
        super(name);
    }
}
class Button extends NamedComponent {
    public Button(String name) {
        super(name);
    }
}
class Label extends NamedComponent {
    public Label(String name) {
        super(name);
    }
}
class TextBox extends NamedComponent {
    public TextBox(String name) {
        super(name);
    }
}
class PasswordBox extends NamedComponent {
    public PasswordBox(String name) {
        super(name);
    }
}
class CheckBox extends NamedComponent {
    public CheckBox(String name) {
        super(name);
    }
}
class LinkLabel extends NamedComponent {
    public LinkLabel(String name) {
        super(name);
    }
}
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ComponentTest.java : 用来测试Component的输出是否满足预期结果
package com.xql.arch.week3;
import org.junit.Assert;
import org.junit.Test;
import java.io.PrintWriter;
import java.io.StringWriter;
public class ComponentTest {
    @Test
    public void testWinForm() {
        Component winForm =
                new WinForm("WINDOW窗口").addChildren(
                        new Picture("LOGO图片"),
                        new Button("登录"),
                        new Button("注册"),
                        new Frame("FRAME1").addChildren(
                                new Label("用户名"),
                                new TextBox("文本框"),
                                new Label("密码"),
                                new PasswordBox("密码框"),
                                new CheckBox("复选框"),
                                new TextBox("记住用户名"),
                                new LinkLabel("忘记密码")
                        )
                );
        StringWriter out = new StringWriter();
        PrintWriter writer = new PrintWriter(out);
        winForm.print(writer);
        System.out.println(out.toString());
        String expected = "print WinForm(WINDOW窗口)\n" +
                "print Picture(LOGO图片)\n" +
                "print Button(登录)\n" +
                "print Button(注册)\n" +
                "print Frame(FRAME1)\n" +
                "print Label(用户名)\n" +
                "print TextBox(文本框)\n" +
                "print Label(密码)\n" +
                "print PasswordBox(密码框)\n" +
                "print CheckBox(复选框)\n" +
                "print TextBox(记住用户名)\n" +
                "print LinkLabel(忘记密码)\n";
        Assert.assertEquals(expected, out.toString());
    }
}
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