架构师训练营W3-作业

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。

public Class Singleton {
private static volatile Singleton instance;
private static Object lock=new Object();
private Singleton(){
}
public static Singleton getInstance(){
   if(instance==null){
      synchronized(lock){
         instance=new Singleton(); 
      }
    }
  }
  return instance;
}

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。
   

• 类设计图(设计的不太好，有很多优化点，比如类继承、容器的抽象)
  
• 测试代码以及相关类

// 测试类
ublic class TestMain {
    public static void main(String[] args) {
        MyComponent form=new MyForm("WinForm");
        MyComponent logo=new MyPicture("Logo");
        MyComponent login=new MyButton("登录");
        MyComponent reg=new MyButton("注册");
        MyComponent userName=new MyLable("用户名");
        MyComponent userPass=new MyLable("密码");
        MyComponent userNameBox=new MyTextBox("用户名输入框");
        MyComponent userPassBox=new MyPasswordBox("密码输入框");
        MyComponent remember=new MyCheckBox("记住用户名");
        MyComponent forget=new MyLinkBox("忘记密码");
        MyComponent frame=new MyLinkBox("FRAME");

        frame.append(userName);
        frame.append(userPass);
        frame.append(userNameBox);
        frame.append(userPassBox);
        frame.append(remember);
        frame.append(forget);
        form.append(logo);
        form.append(login);
        form.append(reg);
        form.append(frame);

        form.print();
    }
}

public interface IPrint {
    void print();
}

public abstract class MyComponent implements IPrint{
    protected String type;
    protected String text;

    public MyComponent(String text){
        this.text=text;
        this.type=this.getClass().getSimpleName();
        childs=new ArrayList<MyComponent>();
    }

    private List<MyComponent> childs;

    public void append(MyComponent component){
        this.childs.add(component);
    }

    public void print() {
        System.out.println(this.type.substring(2)+"("+this.text+")");
        for (MyComponent m:childs) {
            m.print();
        }
    }
}

public class MyButton extends MyComponent {
    public MyButton(String text) {
        super(text);
    }
}

public class MyCheckBox  extends MyComponent  {
    public MyCheckBox(String text) {
        super(text);
    }
}

public class MyForm  extends MyComponent  {

    public MyForm(String text) {
        super(text);
    }
}

public class MyFrame  extends MyComponent  {
    public MyFrame(String text) {
        super(text);
    }
}

public class MyLable  extends MyComponent  {
    public MyLable(String text) {
        super(text);
    }
}

public class MyLinkBox  extends MyComponent  {
    public MyLinkBox(String text) {
        super(text);
    }
}

public class MyPasswordBox  extends MyComponent  {
    public MyPasswordBox(String text) {
        super(text);
    }
}

public class MyPicture  extends MyComponent  {
    public MyPicture(String text) {
        super(text);
    }
}

public class MyTextBox  extends MyComponent  {
    public MyTextBox(String text) {
        super(text);
    }
}