public static void inOrder ( Node root ) {
  if ( root == null ) return ;
  inOrder ( root . left ) ;
  System . out . print ( root . data + " " ) ;
  inOrder ( root . right ) ;
}

public static void inOrder ( Node root ) { if ( root == null ) return ; inOrder ( root . left ) ; System . out . print ( root . data + " ▁ " ) ; inOrder ( root . right ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (null_literal))) consequence: (return_statement)) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (string_literal))))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))