object instance的用法和樣例：
例句
- Method to send notification that an instance of an object is about to be changed.
方法發送對象實例將要更改的通知。 - Which object to be created is decided by the factory based on the criteria's passed to the factory's method that shall instantiate the object.
創建哪個對象由工廠自行判斷，其判斷準則是調用方所調用的用於對象實例化的方法。
