架构师训练营作业 --Week3

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发布于: 2020 年 06 月 23 日
手写Singleton模式类double-checked singleton
组合设计模式练习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。
代码如下：
import java.util.ArrayList;
import java.util.List;
/**
* 组件抽象类，所有的gui组件都应当继承自此类。addComponent 和 removeComponent 方法只适用于
* 包含子组件的组件。
*/
abstract class Component {
	protected String name = "Component";
	void addComponent(final Component component) {
      throw new UnsupportedOperationException("Unsupport add component.");
    }
    void removeComponent(final Component component) {
      throw new UnsupportedOperationException("Unsupport remove component.");
    }
    void print() {
      throw new UnsupportedOperationException("Unsupported print operation.");
    }
    String getName() {
      return this.name;
    }
  }
  class Button extends Component {
    public Button(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print Button(" + this.getName() + ")");
    }
  }
  class Picture extends Component {
    public Picture(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print Picture(" + this.getName() + ")");
    }
  }
  class Label extends Component {
    public Label(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print Label(" + this.getName() + ")");
    }
  }
  class LinkLabel extends Component {
    public LinkLabel(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print LinkLabel(" + this.getName() + ")");
    }
  }
  class TextBox extends Component {
    public TextBox(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print TextBox(" + this.getName() + ")");
    }
  }
  class PasswordBox extends Component {
    public PasswordBox(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print PasswordBox(" + this.getName() + ")");
    }
  }
  class Checkbox extends Component {
    public Checkbox(final String name) {
      this.name = name;
    }
    @Override
    void print() {
      System.out.println("print Checkbox(" + this.getName() + ")");
    }
  }
  class Frame extends Component {
    // child components
    private final List<Component> components;
    public Frame(final String name) {
      this.name = name;
      this.components = new ArrayList<>();
    }
    @Override
    void addComponent(final Component comp) {
      this.components.add(comp);
    }
    @Override
    void removeComponent(final Component comp) {
      this.components.remove(comp);
    }
    @Override
    void print() {
      System.out.println("print Frame(" + this.getName() + ")");
      for (final Component comp : components) {
        comp.print();
      }
    }
  }
  class WinForm extends Component {
    // child components
    private final List<Component> components;
    public WinForm(final String name) {
      this.name = name;
      this.components = new ArrayList<>();
    }
    @Override
    void addComponent(final Component comp) {
      this.components.add(comp);
    }
    @Override
    void removeComponent(final Component comp) {
      this.components.remove(comp);
    }
    @Override
    void print() {
      System.out.println("print WinForm(" + this.getName() + ")");
      for (final Component comp : components) {
        comp.print();
      }
    }
  }
  public class CompositePatternDemo {
    public static void main(final String[] args) {
      final WinForm winForm = new WinForm("Window 窗口");
      final Button btnLogin = new Button("登录");
      winForm.addComponent(btnLogin);
      final Button btnReg = new Button("注册");
      winForm.addComponent(btnReg);
      final Picture pic = new Picture("LOGO图片");
      winForm.addComponent(pic);
      Frame frame = new Frame("Frame1");
      Label lblUser = new Label("用户名");
      frame.addComponent(lblUser);
      TextBox txtUser = new TextBox("文本框");
      frame.addComponent(txtUser);
      Label lblPwd = new Label("密码");
      frame.addComponent(lblPwd);
      PasswordBox pwdbox = new PasswordBox("密码框");
      frame.addComponent(pwdbox);
      Checkbox chk = new Checkbox("复选框");
      frame.addComponent(chk);
      Label lblRememberMe = new Label("记住用户名");
      frame.addComponent(lblRememberMe);
      LinkLabel lnkLbl = new LinkLabel("忘记密码");
      frame.addComponent(lnkLbl);
      winForm.addComponent(frame);
      winForm.print();
	}
}
输出结果：
print WinForm(Window 窗口)
print Button(登录)
print Button(注册)
print Picture(LOGO图片)
print Frame(Frame1)
print Label(用户名)
print TextBox(文本框)
print Label(密码)
print PasswordBox(密码框)
print Checkbox(复选框)
print Label(记住用户名)
print LinkLabel(忘记密码)
﻿