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。
Use this method to obtain the return value of the RPC when RPC is declared with return value.
如果RPC声明了返回值,那么使用该方法来获取RPC的返回值。
SCA does not define a mechanism for making non-blocking calls to methods that return values or are declared to throw exceptions.
SCA并不定义对返回值或声明要引发异常的方法的非阻塞调用的机制。
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