Java 视图到控制器观察者
我需要帮助。我正在努力让我的观察者在 java 中工作。有人可以使用模型-视图-控制器架构向我解释如何从视图到控制器创建和观察者。
这是因为，如果我按下视图上的按钮，操作事件必须调用通知控制器该按钮被按下。
为此，我正在实现观察者以最小化类耦合。
我有一个控制器类、视图（使用 JFrame 的 Swing）和一个包含 main 方法的应用程序类。
我尝试实现它，以便 Controller 实现 Observer，而 View 扩展 Observable。
触发单击按钮的事件后，除了notifyObservers（“OBJECT”）之外的所有代码都会被调用。它消失在java库中的某个地方。
任何帮助将不胜感激。
I need help. I am struggling to get my Observers working in java. Can someone explain to me using MODEL-VIEW-CONTROLLER Architecture how to create and observer from View To Controller.
This is because if i press a button on the view the action event has to call notify the controller of that button being pressed.
For that I'm implementing observers to minimize class coupling.
I have a class Controller, View (Swing using JFrame), and an Application Class that holds the main method.
I tried implementing it so that Controller implements Observer and the View extends Observable.
After triggering the event of clicking the button all code except the notifyObservers("OBJECT") gets called. It disappears somewhere in the java library.
Any Help Will be much appreciated.
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模型应该扩展 observable，视图应该实现观察者（您希望视图依赖于模型）。在更改模型的状态后，您需要调用 setChanged 以强制通知观察者。
the model should extend observable and the view should implement observer (you want the view to depend on the model). you will need to call setChanged to after you change the state of the model to force the observers to be notified.
仔细检查您的控制器是否确实观察/监听（正确的）按钮实例。使用调试器并设置一些断点来检查
notifyObservers是否被调用以及谁正在接收通知。Double check, that your controller is really observing/listening to the (correct) button instance. Use a debugger and set some breakpoints to check whether
notifyObserversis called and who is receiving the notification.