962963964965966967968969970971972
catch (Exception e) { errln("got wrong exception"); } try { nf.removeListener(null); errln("removed null listener"); } catch (NullPointerException e) { logln(e.getMessage()); }
972973974975976977978979980981982
} catch (Exception e) { errln("got wrong exception"); } nf.removeListener(new MyListener()); nf.notifyChanged(); nf.addListener(new MyListener()); nf.removeListener(new MyListener()); }
975976977978979980981982983984985
} nf.removeListener(new MyListener()); nf.notifyChanged(); nf.addListener(new MyListener()); nf.removeListener(new MyListener()); } static class MyListener implements EventListener { }