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Tip: A Better Way to Achieve Random File Access

Despite its name, the java.io.RandomAccessFile class is not very convenient for accessing files in a random-access manner. Learn more about a better way.


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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 Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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