public AbstractTreePrinter println(){
  if (this.preserveSourceLineNumbers) {
    out.append(" ");
    currentColumn++;
    return this;
  }
  out.append("\n");
  currentLine++;
  currentColumn=0;
  return this;
}

public AbstractTreePrinter println ( ) { if ( this . preserveSourceLineNumbers ) { out . append ( " " ) ; currentColumn ++ ; return this ; } out . append ( "\n" ) ; currentLine ++ ; currentColumn = 0 ; return this ; }
outputs a new line .
