public List<String> readFile(String file){ 
 try { 
  Path path = Paths.get(file); 
  return Files.readAllLines(path, 					
	       StandardCharsets.UTF_8); 
 } catch (IOException e) { 
 // io exception reading from file...
 }
  return null; 
} 

public void writeToFile(String file, List<String> lines){ 
 try { 
  Path path = Paths.get(file); 
  Files.write(path, lines); 
 } catch (IOException e) { 
 // io exception writing to file...
 } 
}