question: return the node in the this treegraph corresponding to the specified integer index . concode_field_sep Map<Integer,TreeGraphNode> indexMap concode_elem_sep TreeGraphNode root concode_elem_sep long serialVersionUID concode_field_sep Collection<TreeGraphNode> getNodes concode_elem_sep TreeGraphNode root concode_elem_sep String toString concode_elem_sep void main concode_elem_sep void addNodeToIndexMap
target: TreeGraphNode function ( int arg0 ) { return indexMap . get ( Integer . valueOf ( arg0 ) ) ; }