补救方法是更改代码，以强制转换为正确的对象。

The remedy is to change the code to cast correctly to the right object.

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用于弱类型变量，以将它们强制转换为另一种类型。

Use with weak typed variables to cast them as another type.

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注意，在清单2中，从集合中提取项并不需要将其强制转换为正确的类型。

Notice in Listing 2 that fetching an item out of a collection doesn't require a cast to the right type.

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