Hello,
Here's an example of using RandomAccessFile. I hope it helps
package randomaccessfileproject;
/**
*
* @author Andreea
*/
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
public class RandomAccessFileExample {
public static void main(String[] args) {
try {
/* Create a new instance of RandomAccessFile class. We'll
do a "r"
* read and "w" write operation to the file.
* We are going to use the RandonAccessFile constructor:
* RandomAccessFile(String name, String mode)
* that creates a random access file stream to read from
and to
* write to a file with the specified name("names.dat").
*/
RandomAccessFile raf = new RandomAccessFile("names.dat",
"rw");
// We'll define an array of Strings containing five names.
String names[] = new String[5];
names[0] = "John Doe";
names[1] = "Jane Fonda";
names[2] = "Farrah Fawcett";
names[3] = "Keira Knightley";
names[4] = "Johnny Cash";
for (int i = 0; i < names.length; i++) {
/* writeUTF(String str)
* Writes a string to the file using UTF-8 encoding
* in a machine-independent manner.
*/
raf.writeUTF(names[i]);
}
/* Write another data at the end of the file.
The file pointer can be read by the getFilePointer
method and
set by the seek method
*/
raf.seek(raf.length());
raf.writeUTF("Another data");
// Move the file pointer to the beginning of the file
raf.seek(0);
/* While the file pointer is less than the file length,
read the
next strings of data file from the current position of
the
file pointer. */
while (raf.getFilePointer() < raf.length()) {
System.out.println(raf.readUTF()); // Reads a String
fron this file
}
} catch (FileNotFoundException e) {
// FileNotFoundException can be thrown by the
RandomAccessFile constructor.
e.printStackTrace();
} catch (IOException e) {
// If any byte cannot be read for any reason other than
end-of-file, an IOException is thrown.
// In particular, an IOException may be thrown if the
stream has been closed.
e.printStackTrace();
}
}
}
On Nov 26, 1:57 pm, Programerz <[email protected]> wrote:
> Hello to All java masters,
> I need help in using RandomAcessFile class in java.
> From what I learned it can read and write files with some sort like
> pointer or index.
> does anybody can explain how to use it?
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