Fastest way to write to file?

Question

I made a method that takes a File and a String. It replaces the file with a new file with that string as its contents.

This is what I made

Answer 1

Try using memory mapped files:

FileChannel rwChannel = new RandomAccessFile("textfile.txt", "rw").getChannel();
ByteBuffer wrBuf = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, textToSave.length());

wrBuf.put(textToSave.getBytes());

rwChannel.close();