第一个方法只是设置要访问的目标对象。

The first method just sets a target object to be accessed.

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然后使用所展示的方法来访问并迭代所有目标数据。

Then use the methods shown to access and iterate over all the target data.

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确保目标对象及其子类可以访问工厂方法。

Assure that the factory method is accessible to the target object and its subclasses.

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确保目标对象及其子类可以访问工厂方法。

Assure that the factory method is accessible to the target object and its subclasses.

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