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  1. JDK
  2. JDK-4277377

javax.swing.AbstractListModel throws ClassCastException

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    • Subcomponent:
    • Resolved In Build:
      beta
    • CPU:
      sparc
    • OS:
      solaris_2.6

      Description



      Name: sdC67446 Date: 10/01/99


      The method
          public EventListener[] getListeners(Class listenerType)
      of class
          javax.swing.AbstractListModel
      throws ClassCastException if 'listenerType' is not
      ListDataListener.class.

      The doc says:
      --------------------------------------------------
      public EventListener[] getListeners(Class listenerType)

            Return an array of all the listeners of the given type that were
            added to this model.
            Since:
                  1.3

      The demo test:
      --------------------------------------------------
      import javax.swing.*;
      import javax.swing.event.*;

      public class Test {

          public static class FakeListDataListener implements ListDataListener {
              public void intervalAdded(ListDataEvent event) {}
              public void intervalRemoved(ListDataEvent event) {}
              public void contentsChanged(ListDataEvent event) {}
          }

          public static class StubListModel extends AbstractListModel {
              public int getSize() { return 10; }
              public Object getElementAt(int index) { return null; }
              public void fireContentsChanged(Object object, int index0, int index1) {
                  super.fireContentsChanged(object,index0,index1);
              }
              public void fireIntervalAdded(Object object, int index0, int index1) {
                  super.fireIntervalAdded(object,index0,index1);
              }
              public void fireIntervalRemoved(Object object, int index0, int index1) {
                  super.fireIntervalRemoved(object,index0,index1);
              }
          }

          public static void main(String argv[]) {
              StubListModel model = new StubListModel();
              FakeListDataListener l = new FakeListDataListener();
              try {
                  System.out.println("1");
                  model.addListDataListener(l);
                  model.getListeners(ListDataListener.class);
                  System.out.println("OK");
              } catch (Exception e) {
                  e.printStackTrace();
              }
              try {
                  System.out.println("2");
                  model.addListDataListener(l);
                  model.getListeners(Integer.class);
                  System.out.println("OK");
              } catch (Exception e) {
                  e.printStackTrace();
              }
              try {
                  System.out.println("3");
                  model.addListDataListener(l);
                  model.getListeners(StubListModel.class);
                  System.out.println("OK");
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
      }

      Output:
      --------------------------------------------------
      1
      OK
      2
      java.lang.ClassCastException: [Ljava.lang.Integer;
              at javax.swing.event.EventListenerList.getListeners(EventListenerList.java:124)
              at javax.swing.AbstractListModel.getListeners(AbstractListModel.java:156)
              at Test.main(Test.java:40)
      3
      java.lang.ClassCastException: [LTest$StubListModel;
              at javax.swing.event.EventListenerList.getListeners(EventListenerList.java:124)
              at javax.swing.AbstractListModel.getListeners(AbstractListModel.java:156)
              at Test.main(Test.java:48)

      --------------------------------------------------
      ======================================================================

      Name: sdC67446 Date: 10/12/99


      The same problem:

      1) in javax.swing.DefaultBoundedRangeModel

         The method public EventListener[] getListeners(Class listenerType)
         of class javax.swing.DefaultBoundedRangeModel
         throws ClassCastException if 'listenerType' is not
         ChangeListener.class.

      2) in javax.swing.DefaultListSelectionModel

         The method public EventListener[] getListeners(Class listenerType)
         of class javax.swing.DefaultListSelectionModel
         throws ClassCastException if 'listenerType' is not
         ListSelectionListener.class.

      ======================================================================

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            Assignee:
            sharonz Sharon Zakhour (Inactive)
            Reporter:
            dsvsunw Dsv Dsv (Inactive)
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              Updated:
              Resolved:
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