The Java documentation doesn’t have methods for
opening
files. How do I connect a filename on
disk with a Reader
, Writer
, or
Stream
?
The action of constructing a FileReader
,
FileWriter
, FileInputStream
, or
FileOutputStream
corresponds to the
“open” operation in most I/O packages. There is no
explicit open operation, perhaps as a kind of rhetorical flourish of
the Java API’s object-oriented design. So to read a text file,
you’d create, in order, a FileReader
and a
BufferedReader
. To
write a file a byte at a
time, you’d create a FileOutputStream
, and
probably a BufferedOutputStream
for efficiency:
// OpenFileByName.java BufferedReader is = new BufferedReader(new FileReader("myFile.txt")); BufferedOutputStream bytesOut = new BufferedOutputStream( new FileOutputStream("bytes.dat")); ... bytesOut.close( );
Remember that you will need to handle IOException
around these calls.
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