Read 2 Bytes from 23GB file

Question

Is there an easy and fast way to read two bytes from a 23gb large file in java? The Problem is that read() method (FileInputStream) only supports int as offset. Reading chunks of size 2GB in memory takes to long... There musst be a way to skip let's say 15.000.000.000 bytes?

Answer 1

Use nio FileChannel position(long newPosition) method. To get it, call getChannel() on the good old FileInputStream instance.

Answer 2

Using FileChannel and ByteBuffer:

ByteBuffer bb = ByteBuffer.allocate(1);
FileChannel.open(file.toPath()).position(15e9).read(bb);
byte b = bb.get();