Posted By:
yang_shuai
Posted On:
Thursday, December 13, 2007 03:06 PM
i saw the following text in the sun's java tutorial Notice that read() returns an int value. If the input is a stream of bytes, why doesn't read() return a byte value? Using a int as a return type allows read() to use -1 to indicate that it has reached the end of the stream. now, i have a question that, if the return type is byte, -1 is also include in the byte value range -128 to 127, why must use int to achieve this? and, there is a book from oreilly Java I/O, 2nd Edition By Elliotte Rusty Harold ............................................... Publisher: O'Reilly Pub Date: May 2006 Print ISBN-10: 0-596-52750-0 Print ISBN-13: 978-0-59-652750-1
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i saw the following text in the sun's java tutorial
Notice that read() returns an int value. If the input is a stream of bytes, why doesn't read() return a byte value? Using a int as a return type allows read() to use -1 to indicate that it has reached the end of the stream.
now, i have a question that, if the return type is byte, -1 is also include in the byte value range -128 to 127, why must use int to achieve this?
and, there is a book from oreilly
Java I/O, 2nd Edition
By Elliotte Rusty Harold
...............................................
Publisher: O'Reilly
Pub Date: May 2006
Print ISBN-10: 0-596-52750-0
Print ISBN-13: 978-0-59-652750-1
in the book, the author said that:
The fundamental method of the InputStream class is read( ). This method reads a single unsigned byte of data and returns the integer value of the unsigned byte. This is a number between 0 and 255:
public abstract int read( ) throws IOException
i think this explanation is right, what do you think???
Great thanks!
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