On Fri, 2 Jul 2021 17:27:34 GMT, Joe Wang <[email protected]> wrote:
>> Brian Burkhalter has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> 6766844: Correct error messages in test
>
> src/java.base/share/classes/java/io/ByteArrayInputStream.java line 161:
>
>> 159: * Unlike the {@link InputStream#read(byte[],int,int) overridden
>> method}
>> 160: * of {@code InputStream}, this method returns {@code -1} instead
>> of zero
>> 161: * if the end of the stream has been reached and {@code len == 0}.
>
> The statement "return -1 if the end of the stream has been reached and len ==
> 0" gives an impression that it requires both conditions to be met: end of the
> stream && len==0, but the tests show -1 is expected if len == 0 without an
> attempt to read the stream.
>
> The overridden method stated that "If len is zero, then no bytes are read and
> 0 is returned", the above note looks like was meant for this statement since
> the overridden method also return -1 if the stream is at end of file.
Both conditions of the statement are intended to be met. If the stream is at
its end then
if (pos >= count) {
return -1;
}
will cause `-1` to be returned because at end of stream the condition `pos >=
count` is met.
The overridden method always returns `0` if `len == 0`.:
public int read(byte b[], int off, int len) throws IOException {
Objects.checkFromIndexSize(off, len, b.length);
if (len == 0) {
return 0;
}
-------------
PR: https://git.openjdk.java.net/jdk17/pull/189
