Java Reference
In-Depth Information
// Close the output stream
System.out.println("New contents of hamlet.txt written");
} catch (FileNotFoundException fnfe) {
System.out.println("Couldn't find a file called " + fileName);
} catch (IOException ioe) {
System.out.println("Couldn't write to a file called " + fileName);
private static void reverseByteArray(byte[] inBytes) {
int inLength = inBytes.length;
for (int i = 0; i < inLength >> 1; i++) {
byte temp = inBytes[i];
inBytes[i] = inBytes[inLength - i - 1];
inBytes[inLength - i - 1] = temp;
And now we have Hamlet going forwards and backwards in Listing 8-18.
Listing 8-18. Original and reversed content
To sleep: perchance to dream: ay, there's the rub;
For in that sleep of death what dreams may come
When we have shuffled off this mortal coil,
Must give us pause: there's the respect
That makes calamity of so long life
efil gnol os fo ytimalac sekam tahT
tcepser eht s'ereht :esuap su evig tsuM
,lioc latrom siht ffo delffuhs evah ew nehW
emoc yam smaerd tahw htaed fo peels taht ni roF
;bur eht s'ereht ,ya :maerd ot ecnahcrep :peels oT
Software developers often need to work with files, and Java has a rich set of classes that let us do so. As
we saw, we use the File class to work with files and directories, and we use streams ( FileInputStream
objects and FileOutputStream objects) to read and write files. We learned a number of things about File ,
FileInputStream , and FileOutputStream objects:
A File object can represent a directory structure defined by a path.
A File object is not a file or directory. It is an object that represents a file or
The file or directory represented by a File object does not necessarily exist.
A failed attempt to create directories can leave unwanted directories, so we need
to clean up after a failed directory creation operation.
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