import java.io.File;
import java.io.RandomAccessFile;
public class Main {
public static void append(String fileName, String text) throws Exception {
File f = new File(fileName);
long fileLength = f.length();
RandomAccessFile raf = new RandomAccessFile(f, "rw");
raf.seek(fileLength);
raf.writeBytes(text);
raf.close();
}
public static void append(String fileName, byte[] bytes) throws Exception {
File f = new File(fileName);
long fileLength = f.length();
RandomAccessFile raf = new RandomAccessFile(f, "rw");
raf.seek(fileLength);
raf.write(bytes);
raf.close();
}
public static void main(String[] args) throws Exception {
append("c:\\tmp.txt", "Appended Data");
append("c:\\tmp.bin", "Appended Data".getBytes());
}
}