JAVA中的流结束

Question

I am confused by the following statement that appears 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.

Since one byte can represent up to 256 integers, I fail to see how it can represent 0 to 256 and -1. Can someone please comment on what I am missing here?

Answer 1

Although the read() operation just reads a byte it actually returns an int so there is no problem.

Just values in range 0-255 are returned though, aside from the special -1 end of stream value.

Answer 2

它返回一个int ，而不是一个byte ，所以虽然它通常只包含0-255，但它可以包含其他值。

Answer 3

InputStream＃read（）的返回类型是一个int ，如果该值在0-255范围内，则可以将其读取为一个byte 。