static double nextDouble ( ) throws IOException {
  in . nextToken ( ) ;
  return in . nval ;
}

static double nextDouble ( ) throws IOException { in . nextToken ( ) ; return in . nval ; }
(method_declaration (modifiers) type: (floating_point_type) name: (identifier) parameters: (formal_parameters) (throws (type_identifier)) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (return_statement (field_access object: (identifier) field: (identifier)))))