The getListeners() implemented at DefaultTreeSelectionModel level doesn't return the correct value for PropertyChangeListener.

For the following program, getListeners() always returns 0 no matter how many PropertyChangeListeners you add to the component.


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import javax.swing.tree.*;
import java.beans.*;
import java.util.*;

public class TestGetListenersForDefaultTreeSelectionModel
implements PropertyChangeListener{

    DefaultTreeSelectionModel aComp = new DefaultTreeSelectionModel();
    EventListener[] eventListener;

    public TestGetListenersForDefaultTreeSelectionModel() {
        eventListener = aComp.getListeners(PropertyChangeListener.class);
        System.out.println("Before adding a listener: " + eventListener.length);

        aComp.addPropertyChangeListener(this);

        eventListener = aComp.getListeners(PropertyChangeListener.class);
        System.out.println("After adding a listener: " + eventListener.length);
    }

    public void propertyChange(PropertyChangeEvent e) {}

    public static void main(String[] args) {
        new TestGetListenersForDefaultTreeSelectionModel();
    }
}

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edmund.lou@eng 1999-07-27
JFC SQE