Now we will add the output or return information for the operation.
现在我们将为操作添加输出或返回信息。
As with the field calls, the first two variants return information for public methods that can be accessed through the class — even those inherited from an ancestor class.
与字段调用一样,前两个变量返回可以通过类接入的公共方法的信息——即使它们来自于祖先类。
The last two return information for fields declared directly by the class — regardless of the fields' access types.
后两个变量返回类直接声明的字段的信息——与字段的接入类型无关。
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