public synchronized Object set(Object key, Object value) {
public synchronized Object set(Object key, Object value, boolean replace) {
	public synchronized Object set(Object key, Object value) {		if (key instanceof String)			key = ((String)key).intern();		int i = getIndex(key);		if (value == null) /* remove */		{			if (i != -1)				return remove(i);		} else /* put */		{			if (i != -1) /* duplicate key */				throw new IllegalArgumentException(NLS.bind(Msg.HEADER_DUPLICATE_KEY_EXCEPTION, key));			add(key, value);		}		return null;	}