架构训练营第三周作业

李日盛

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发布于: 2020 年 11 月 08 日

手写一个单例实现

基于组合模式，打印 windows 窗口树结构

类的 UML 结构图如下：

输出结果如下：

代码实现：

接口类:Component

package week3;
/** * @Description: 定义组件的基本行为 * @Author: easonlee * @CreateDate 2020/11/8 */public interface Component {
    /***     * 打印自身和子组件内容     */    void print();
    /***     * 增加子节点     * @param child     */    void addChild(Component child);
    /***     * 删除子节点     * @param child     */    void removeChild(Component child);
}

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包含子节点的实现类：ContainerComponent

package week3;
import java.util.HashSet;import java.util.Set;
/** * @Description: TODO * @Author: easonlee * @CreateDate 2020/11/8 */public class ContainerComponent implements Component{
    private String name;    private String title;    private Set<Component> childElements;
    public ContainerComponent(String name, String title){        this.name = name;        this.title = title;        childElements = new HashSet<>();    }

    @Override    public void print() {        StringBuffer content = new StringBuffer();        content.append("+");        content.append(" ").append(name).append(" ").append("(").append(title).append(")");        System.out.println(content);        for (Component c:childElements){            c.print();        }    }
    @Override    public void addChild(Component child) {        childElements.add(child);    }
    @Override    public void removeChild(Component child) {        childElements.remove(child);    }}

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不含子节点的实现类：SingleComponent

package week3;
/** * @Description: TODO * @Author: easonlee * @CreateDate 2020/11/8 */public class SingleComponent implements Component{
    private String name;    private String title;
    public SingleComponent(String name, String title){        this.name = name;        this.title = title;    }
    @Override    public void print() {        StringBuffer content = new StringBuffer();        content.append("  ").append("-");        content.append(" ").append(name).append(" ").append("(").append(title).append(")");        System.out.println(content);    }
    @Override    public void addChild(Component child) {        throw new UnsupportedOperationException("对象不支持此功能");    }
    @Override    public void removeChild(Component child) {        throw new UnsupportedOperationException("对象不支持此功能");    }}

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运行的 main 类：ComponentMainDemo

package week3;

/** * @Description: TODO * @Author: easonlee * @CreateDate 2020/11/8 */public class ComponentMainDemo {
    public static void main(String[] args) {        Component root = new ContainerComponent("WinForm","WINDOWS窗口");        Component logo = new SingleComponent("Picture","LOGO图片");
        Component loginButton = new SingleComponent("Button","登录");        Component regisButton = new SingleComponent("Button","注册");        Component inputFrame = new ContainerComponent("Frame","FRAME1");        Component userNameLabel = new SingleComponent("Label","用户名");        Component userNameInput = new SingleComponent("TextBox","文本框");        Component passwordLabel = new SingleComponent("Label","密码");        Component passwordInput = new SingleComponent("PasswordBox","密码框");        Component rememberCheck = new SingleComponent("CheckBox","复选框");        Component remember = new SingleComponent("TextBox","记住用户名");        Component forgetLabel = new SingleComponent("PrintLabel","忘记密码");
        root.addChild(logo);        root.addChild(loginButton);        root.addChild(regisButton);        root.addChild(inputFrame);
        inputFrame.addChild(userNameLabel);        inputFrame.addChild(userNameInput);        inputFrame.addChild(passwordLabel);        inputFrame.addChild(passwordInput);        inputFrame.addChild(rememberCheck);        inputFrame.addChild(remember);        inputFrame.addChild(forgetLabel);
        root.print();

    }}