Javafx和Observer模式 - 更新UI(Javafx and the Observer pattern - updating a UI)

 我正在尝试在JavaFx应用程序中实现Observer模式。 我从来没有问过这个问题，但这让我有点疯狂。 
 
 本质上我正在尝试使用Observer模式来监视一个解析电话号码文件的类，并在解析文件时自动更新UI。 
 
 在我回答我的问题之前，这是我的代码： 
 
 抽象类Observer.java 
 
public abstract class Observer 
{
   public PhoneBook numbers;

   public abstract void update();
}
 
 我有一个实现这个的类： 
 
public class PhoneBookObserver extends Observer {

    public PhoneBookObserver(PhoneBook numbers)
    {
        this.numbers = numbers;
        this.numbers.attach(this);
    }

    @Override
    public void update()
    {
        System.out.println(""NUMBER - : " + numbers.GetNumbers());

    }
}
 
 在进行解析的类中，我创建了一个新的PhoneBookObserver 
 
public PhoneBook ParsePhoneBook() 
{   
    PhoneBook nums= new PhoneBook();
    PhoneBookObserver p = new PhoneBookObserver(nums);

    // ... Parsing of file - works fine

   return nums;
}
 
 目前运行并输出我在PhoneBookObserver中的update（）的println。 
 
 我的问题是： 
 
 
 
 PhoneBookObserver的更新方法可以为我更新我的UI吗？ 它如何访问控制器中的JavaFx元素？ 
 
 
 我可以让我的控制器成为观察者，覆盖update（）并使用它来更新我的控制器中的UI元素吗？ 那不好吗？ 
 

I am trying to implement the Observer pattern in a JavaFx application. I've never asked a question here but this is driving me a bit crazy.
 
Essentially I'm trying to use the Observer pattern to monitor a class that's parsing a file of phone numbers, and update the UI automatically as the file is parsed.
 
Before I get to my questions, here is my code:
 
Abstract class Observer.java
 
public abstract class Observer 
{
   public PhoneBook numbers;

   public abstract void update();
}
 
I have a class that implements this:
 
public class PhoneBookObserver extends Observer {

    public PhoneBookObserver(PhoneBook numbers)
    {
        this.numbers = numbers;
        this.numbers.attach(this);
    }

    @Override
    public void update()
    {
        System.out.println(""NUMBER - : " + numbers.GetNumbers());

    }
}
 
In the class doing the parsing, I've created a new PhoneBookObserver 
 
public PhoneBook ParsePhoneBook() 
{   
    PhoneBook nums= new PhoneBook();
    PhoneBookObserver p = new PhoneBookObserver(nums);

    // ... Parsing of file - works fine

   return nums;
}
 
Currently this runs and my println from update() in PhoneBookObserver is output.
 
My questions are:
 
 
 
Can the update method of PhoneBookObserver update my UI for me? How would it access JavaFx elements in my controller?
 
 
Can I just make my controller an observer, override update() and use that to update my UI elements from within my controller? Is that bad?
 

原文：https://stackoverflow.com/questions/42566161