RandomAccessFile
RandomAccessFile randomAccessFile = new RandomAccessFile("data/data.txt", "r");
byte[] dest = new byte[1024];
int offset = 0;
int length = 1024;
int bytesRead = randomAccessFile.read(dest, offset, length);
3.75
4
RandomAccessFile file = new RandomAccessFile("c:\\data\\file.txt", "rw");
file.write(65); // ASCII code for A
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