架构师第 3 周作业

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发布于: 2020 年 06 月 24 日
作业：1手写单例模式并拍照
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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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解答第2题如下：
步骤1新建java project工程如图：
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步骤2建立抽象类Component，代码如下：
package com.geekbang.design.CompositePattern;
public abstract class Component {
    public void add(Component component){
        throw new UnsupportedOperationException("不支持添加操作");
    }
    public void remove(Component component){
        throw new UnsupportedOperationException("不支持删除操作");
    }
    public void print(){
        throw new UnsupportedOperationException("不支持打印操作");
    }
}
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步骤3建立实现类Frame,Panel,WinForm分别继承于Cmponent
package com.geekbang.design.CompositePattern;
import com.geekbang.design.CompositePattern.Component;
import java.util.ArrayList;
import java.util.List;
public class Frame extends Component {
    private List<Component> items = new ArrayList<>();
    private String name;
    public Frame(String name) {
        this.name = name;
    }
    @Override
    public void add(Component component) {
        items.add(component);
    }
    @Override
    public void remove(Component component) {
        items.remove(component);
    }
    @Override
    public void print() {
        System.out.println(this.name);
        for (Component component : items) {
            component.print();
        }
    }
}
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package com.geekbang.design.CompositePattern;
import com.geekbang.design.CompositePattern.Component;
public class Panel extends Component {
    private String name;
    public Panel(String name){
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println(name);
    }
}
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import com.geekbang.design.CompositePattern.Component;
import java.util.ArrayList;
import java.util.List;
public class WinForm extends Component {
    private List<Component> items = new ArrayList<>();
    private String name;
    public WinForm(String name) {
        this.name = name;
    }
    @Override
    public void add(Component component) {
        items.add(component);
    }
    @Override
    public void remove(Component component) {
        items.remove(component);
    }
    @Override
    public void print() {
        System.out.println(this.name);
        for (Component component : items) {
           component.print();
        }
    }
}
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步骤4书写Test测试类
package com.geekbang.design.CompositePattern;
public class Test {
    public static void main(String[] args) {
        Component winForm = new WinForm("print WinForm(WINDOW窗口)");
        Component picture = new Panel("print Picture(LOGO图片)");
        Component signIn = new Panel("pint Button(登录)");
        Component signUp = new Panel("print Button(注册)");
        Component frame = new Frame("print Frame(FRAME1)");
        Component lable1 = new Panel("print Lable(用户名)");
        Component textBox = new Panel("print TextBox(文本框)");
        Component lable2 = new Panel("print Lable(密码)");
        Component passwordBox = new Panel("print PasswordBox(密码框)");
        Component checkBox = new Panel("print CheckBox(复选框)");
        Component textBox2 = new Panel("print TextBox(记住用户名)");
        Component linkLable = new Panel("print LinkLable(忘记密码)");
        frame.add(lable1);
        frame.add(textBox);
        frame.add(lable2);
        frame.add(passwordBox);
        frame.add(checkBox);
        frame.add(textBox2);
        frame.add(linkLable);
        winForm.add(picture);
        winForm.add(signIn);
        winForm.add(signUp);
        winForm.add(frame);
        winForm.print();
    }
}
输出结果如下图所示：
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发布于: 2020 年 06 月 24 日阅读数: 32
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