Name: sdR10048 Date: 04/13/2001


public AncestorListener[] javax.swing.JComponent.getAncestorListeners()
returns empty array of AncestorListeners if some has been added
previously.

Javadoc says:
public AncestorListener[] getAncestorListeners()

    Returns an array of all the ancestor listeners registered on this component.
    Returns:
        all of the component's AncestorListeners or an empty array if no ancestor listeners are currently registered
    Since:
        1.4
    See Also:
        addAncestorListener(javax.swing.event.AncestorListener),
        removeAncestorListener(javax.swing.event.AncestorListener)
        
See example:
--------------------------------------------------
[sword] ~/tmp
% cat test.java
import javax.swing.*;
import javax.swing.event.*;

class FakeAncestorAdapter implements AncestorListener {
     public void ancestorAdded(AncestorEvent event){}
     public void ancestorRemoved(AncestorEvent event){}
     public void ancestorMoved(AncestorEvent event){}
     public boolean isChanged() {
         return false;
     }
}

public class test {
    public static void main(String[] args) {
        JComponent j = new JLabel();
        j.addAncestorListener(new FakeAncestorAdapter());
        AncestorListener[] ls = j.getAncestorListeners();
        System.out.println(ls.length);
    }
}

[sword] ~/tmp
% java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b60)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b60, mixed mode)

[sword] ~/tmp
% javac test.java

[sword] ~/tmp
% java test
0
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