java - JAVA中的流结束

Question

我对出现的以下语句感到困惑here

The basic read() method of the InputStream class reads a single unsigned byte of data and returns the int value of the unsigned byte. This is a number between 0 and 255. If the end of stream is encountered, it returns -1 instead; and you can use this as a flag to watch for the end of stream.

由于一个字节最多可以表示 256 个整数，我看不出它如何表示 0 到 256 和 -1。有人可以评论我在这里缺少的东西吗？

Answer 1

InputStream#read() 的返回类型是一个 int，如果值在 0-255 范围内，则可以将其读取为 byte。