作业-week3

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。
   

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。
   

组合模式代码地址

Component 抽象类

public abstract class Component {
    private final String name;
    private String parentName;
    public Component(String name) {
       this.name = name;
    }
    public String getName() {
        return this.name;
    }
    public String getParentName() {
        return parentName;
    }
    public void setParentName(String parentName) {
        this.parentName = parentName;
    }
    public abstract void print();
}

public class ElementComponent extends Component{
    public ElementComponent(String name) {
        super(name);
    }
    @Override
    public void print() {
        System.out.println(getParentName() + " 的叶子节点: " + getName());
    }
}

public class ElementContainer extends Component {
    private List<Component> subComponentList = new ArrayList<>();
    public ElementContainer(String name) {
        super(name);
    }
    public void addElement(Component c) {
        c.setParentName(this.getName());
        subComponentList.add(c);
    }
    public List<Component> getSubComponentList() {
        return subComponentList;
    }
    @Override
    public void print() {
        System.out.println("树枝节点: " + getName());
    }
}

public class Client {
    private static ElementContainer root;
    public static void main(String[] args) {
        init();
        root.print();
        printInfo(root);
    }
    private static void init() {
        // 创建对象
        ElementContainer window = new ElementContainer("window窗口");
        ElementContainer frame = new ElementContainer("登录Frame");
        Component logoPic = new ElementComponent("logo图片");
        Component loginButton = new ElementComponent("登录按钮");
        Component registerButton = new ElementComponent("注册按钮");
        Component usernameLabel = new ElementComponent("用户名label");
        Component usernameTextBox = new ElementComponent("用户名文本框");
        Component passwordLabel = new ElementComponent("密码label");
        Component passwordTextBox = new ElementComponent("密码文本框");
        Component rememberPasswordCheckBox = new ElementComponent("是否记住密码复选框");
        Component rememberPasswordLabel = new ElementComponent("记住密码label");
        Component forgetPasswordLink = new ElementComponent("忘记密码link");
        // 组装
        window.addElement(logoPic);
        window.addElement(frame);
        window.addElement(loginButton);
        window.addElement(registerButton);
        frame.addElement(usernameLabel);
        frame.addElement(usernameTextBox);
        frame.addElement(passwordLabel);
        frame.addElement(passwordTextBox);
        frame.addElement(rememberPasswordCheckBox);
        frame.addElement(rememberPasswordLabel);
        frame.addElement(forgetPasswordLink);
        root = window;
    }
    private static void printInfo(ElementContainer root) {
        if (root != null && !root.getSubComponentList().isEmpty()) {
            for (Component e : root.getSubComponentList()) {
                e.print();
                if (e instanceof ElementContainer) {
                    printInfo((ElementContainer)e);
                }
            }
        }
    }
}

打印结果

        树枝节点: window窗口
        window窗口 的叶子节点: logo图片
        树枝节点: 登录Frame
        登录Frame 的叶子节点: 用户名label
        登录Frame 的叶子节点: 用户名文本框
        登录Frame 的叶子节点: 密码label
        登录Frame 的叶子节点: 密码文本框
        登录Frame 的叶子节点: 是否记住密码复选框
        登录Frame 的叶子节点: 记住密码label
        登录Frame 的叶子节点: 忘记密码link
        window窗口 的叶子节点: 登录按钮
        window窗口 的叶子节点: 注册按钮