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我需要處理2個類之間的更改交互。java屬性更改監聽器
public class HeadClass {
private Subclass sub;
public void refresh() {...}
}
public class Subclass{
ArrayList store;
public void add(T data)
store.add(data);
firePropertyChange(...);
}
每當方法在子類中「添加」被稱爲「刷新」,在HeadClass應該叫方法! 但其中i類應該實現這一行:
private PropertyChangeSupport changes = new PropertyChangeSupport(/*WHAT SHOULD BE HERE?*/);
如果我在HeadClass實現它,我可以這樣的反應:
changes.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent event) {
refresh();
}
});
但是我應該如何從子類火對PropertyChangeEvents如果我不能訪問propertyChangeSupport「更改」?