Reads up to
len bytes of data from the input stream into
an array of bytes. An attempt is made to read as many as
len bytes, but a smaller number may be read.
The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
len is zero, then no bytes are read and
0 is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at end of
file, the value
-1 is returned; otherwise, at least one
byte is read and stored into
The first byte read is stored into element
next one into
b[off+1], and so on. The number of bytes read
is, at most, equal to
len. Let k be the number of
bytes actually read; these bytes will be stored in elements
In every case, elements
b[off] and elements
b[b.length-1] are unaffected.
InputStream simply calls the method
read() repeatedly. If the first such call results in an
IOException, that exception is returned from the call to
len) method. If
any subsequent call to
read() results in a
IOException, the exception is caught and treated as if it
were end of file; the bytes read up to that point are stored into
b and the number of bytes read before the exception
occurred is returned. The default implementation of this method blocks
until the requested amount of input data
len has been read,
end of file is detected, or an exception is thrown. Subclasses are encouraged
to provide a more efficient implementation of this method.
|the buffer into which the data is read.|
| the start offset in array |
|the maximum number of bytes to read.|
-1 if there is no more data because the end of
the stream has been reached.
|If the first byte cannot be read for any reason other than end of file, or if the input stream has been closed, or if some other I/O error occurs.|
| If |
| If |