Component implementation of getListeners() returns incorrect value for PropertyChangeListener.
getListeners() in the following program returns 0 for PropertyChangeListner all the time no matter how many PropertyChangeListeners you add.
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import java.awt.*;
import java.beans.*;
import java.util.*;
public class TestGetListenersForComponent
implements PropertyChangeListener{
Canvas canvas = new Canvas();
EventListener[] eventListener;
public TestGetListenersForComponent() {
eventListener = canvas.getListeners(PropertyChangeListener.class);
System.out.println("Before adding a listener: " + eventListener.length);
canvas.addPropertyChangeListener(this);
eventListener = canvas.getListeners(PropertyChangeListener.class);
System.out.println("After adding a listener: " + eventListener.length);
}
public void propertyChange(PropertyChangeEvent e) {}
public static void main(String[] args) {
new TestGetListenersForComponent();
}
}
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edmund.lou@eng 1999-07-27
JFC SQE