code: public final void save(final String comment, final boolean sortByKey) throws IOException, MergeException, LockingFailedException {
          save(new String[] { comment }, sortByKey);
      }
docs: Save the content from memory to disk.
  
  @param comment
  Comment to prepend (Should not include the "#" comment sign - It will be prepended automatically).
  @param sortByKey
  Sort the properties by key before saving?
  
  @throws IOException
  Error writing the file.
  @throws MergeException
  One or more properties were modified concurrently.
  @throws LockingFailedException
  Locking the file failed.