TitledBorder.java 文件源码

private void installPropertyChangeListeners() {
    final WeakReference<TitledBorder> weakReference = new WeakReference<TitledBorder>(this);
    final PropertyChangeListener listener = new PropertyChangeListener() {
        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            if (weakReference.get() == null) {
                UIManager.removePropertyChangeListener(this);
                UIManager.getDefaults().removePropertyChangeListener(this);
            } else {
                String prop = evt.getPropertyName();
                if ("lookAndFeel".equals(prop) || "LabelUI".equals(prop)) {
                    label.updateUI();
                }
            }
        }
    };

    UIManager.addPropertyChangeListener(listener);
    UIManager.getDefaults().addPropertyChangeListener(listener);
}