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void exampleFuntionreadData() throws IOException{
  BufferedReader br = new BufferedReader(new InputStreamReader(
  new FileInputStream("file")));
  // Read from the file

}

void exampleFuntionreadData() throws IOException{
  ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
  try(FileChannel rdr = (new FileInputStream("file")).getChannel()){
   	while (rdr.read(buffer) > 0) {
      // Do something with the buffer
	  buffer.clear();
	}
  } 
  catch (Exception e) {
    // Handle error
  }
}