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Tip of the Day
Language: Java
Expertise: Beginner
May 2, 2018

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A Better Way to Achieve Random File Access

RandomAccessFile raf = new RandomAccessFile(f, ???r???);
for (???) {
     raf.seek(pos);
     byte b = raf.readByte();
}

Despite its name, the java.io.RandomAccessFile class is not very convenient for accessing files in a random-access manner, such as: seek, read, seek, read. Each of these directly issue the corresponding system calls/ioctl on the file descriptor. You can do that using MappedByteBuffer, like this:

FileInputStream in = new FileInputStream(f);
MappedByteBuffer map = in.getChannel().map(MapMode.READ_ONLY, 0, f.length());
for (???) {
byte b = map.get(pos);
}
Octavia Anghel
 
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