question: private String formatNode ( RightThreadedBinaryNode < T > node ) { RightThreadedBinaryNode < T > n ; StringBuilder response = new StringBuilder ( "(" ) ; if ( ( n = node . getLeftSon ( ) ) != null ) { response . append ( formatNode ( n ) ) ; } response . append ( node . toString ( ) ) ; if ( ( n = node . getRightSon ( ) ) != null ) { response . append ( formatNode ( n ) ) ; } response . append ( ")" ) ; return response . toString ( ) ; }
target:  Format the node, recursively.