James Gosling 对 Java 字节为何有符号的解释
最初我很惊讶 Java 决定指定 byte 有符号，范围为 -128..127（含）。我的印象是大多数 8 位数字表示形式都是无符号的，其范围为 0..255 （例如 点十进制表示法的 IPv4）。
那么 James Gosling 是否曾被要求解释为什么他决定对 byte 进行签名？权威编程语言设计者和/或评论家之间过去是否对这个问题进行过值得注意的讨论/辩论？
I was initially surprised that Java decides to specify that byte is signed, with a range from -128..127 (inclusive). I'm under the impression that most 8-bit number representations are unsigned, with a range of 0..255 instead (e.g. IPv4 in dot-decimal notation).
So has James Gosling ever been asked to explain why he decided that byte is signed? Has there been notable discussions/debates about this issue in the past between authoritative programming language designers and/or critics?
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看来简单是主要原因。来自本次采访：
我最初的假设是，这是因为 Java 根本没有无符号数字类型。为什么
byte应该是一个例外？char是一种特殊情况，因为它必须表示 UTF-16 代码单元（感谢 Jon Skeet 的引用）It appears that simplicity was the main reason. From this interview:
My initial assumption was that it's because Java doesn't have unsigned numeric types at all. Why should
bytebe an exception?charis a special case because it has to represent UTF-16 code units (thanks to Jon Skeet for the quote)根据“Oak 语言规范 0.2”（又名 Java 语言）：
“Oak 字节类型是 C 程序员习惯于将其视为 char 类型的类型。但在 Oak 语言中，字符为 16 位宽。具有单独的字节type 消除了 C 语言中 char 解释为 8 位整数和字符之间的混淆。”
您可以从这里获取附记副本：
http://cretesoft.com/archive/files/OakSpec0.2.ps (scribd 上的部分副本）
此外，该网站上还发布了采访的一部分：（他为 java 中缺少无符号字节辩护）
< a href="http://www.darksleep.com/player/JavaAndUnsignedTypes.html" rel="noreferrer">http://www.darksleep.com/player/JavaAndUnsignedTypes.html
添加来自以下内容的采访上述页面...
*”
http://www.gotw.ca/publications/c_family_interview.htm
另一方面....根据 http://www.artima.com /weblogs/viewpost.jsp?thread=7555
As per 'Oak Language Specification 0.2' aka Java language:
"The Oak byte type is what C programmers are used to thinking of as the char type. But in the Oak language, characters are 16 bits wide. Having a separate byte type removes the confusion in C between the interpretation of char as an 8 bit integer and as a character."
You can grab a postscript copy from here :
http://cretesoft.com/archive/files/OakSpec0.2.ps (partial copy on scribd)
Also there is a part of interview posted on this site: (Where he is defending the absence of unsigned byte in java)
http://www.darksleep.com/player/JavaAndUnsignedTypes.html
Adding the interview taken from the above mentioned page...
*"
http://www.gotw.ca/publications/c_family_interview.htm
On the other hand.... According to http://www.artima.com/weblogs/viewpost.jsp?thread=7555
我不知道 James Gosling 有任何直接引用，但有一个关于 unsigned
byte的官方 RFE：I'm not aware of any direct quotes from James Gosling, but there's an official RFE for unsigned
byte:字节没有理由被无符号。当您使用char类型来表示字符时，byte通常不会完成char的工作。There's no reason for a
byteto be unsigned. when you havechartype to represent characters, thebytewould normally not do that job of achar.