static boolean topsyTurvy ( char [ ] str ) {
  for ( int i = 0 ;
  i < str . length ;
  i ++ ) {
    if ( str [ i ] == '2' || str [ i ] == '4' || str [ i ] == '5' || str [ i ] == '6' || str [ i ] == '7' || str [ i ] == '9' ) {
      return false ;
    }
  }
  return true ;
}

static boolean topsyTurvy ( char [ ] str ) { for ( int i = 0 ; i < str . length ; i ++ ) { if ( str [ i ] == '2' || str [ i ] == '4' || str [ i ] == '5' || str [ i ] == '6' || str [ i ] == '7' || str [ i ] == '9' ) { return false ; } } return true ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (integral_type) dimensions: (dimensions)) name: (identifier))) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)))) consequence: (block (return_statement (false)))))) (return_statement (true))))