谢谢指出这里的错误，去JLS里查找了以下，果然是有这样的说明的 https://docs.oracle.com/javase/specs/jls/se8/html/jls-5.html#jls-5.6.2 1. Widening primitive conversion (§5.1.2 <https://docs.oracle.com/javase/specs/jls/se8/html/jls-5.html#jls-5.1.2>) is applied to convert either or both operands as specified by the following rules: - If either operand is of type double, the other is converted to double. - Otherwise, if either operand is of type float, the other is converted to float. - Otherwise, if either operand is of type long, the other is converted to long. - Otherwise, both operands are converted to type int. 我会联系编辑看如何进行修正。 gaokechen <notifications@github.com> 于2020年6月26日周五下午9:04写道：

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两个 byte 相加，返回值的类型并不是byte而是int，需要强制转换成byte。并且可能会超出数据有效范围出现异常值。 [image: 微信截图_20200626205929] <https://user-images.githubusercontent.com/32739652/85859613-06a91600-b7f0-11ea-83b5-e6eb0c99eed8.png> [image: 微信截图_20200626205518] <https://user-images.githubusercontent.com/32739652/85859629-0c9ef700-b7f0-11ea-9d14-2a7e73515baa.png> — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#4>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAE2IT5WLOHTZFKCQHQIR33RYSMG3ANCNFSM4OJJ5QGQ> .

两个 byte 相加，返回值的类型是int #4

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