static int findNthEvenDigitNumber ( int n ) {
  if ( n == 1 ) {
    return 0 ;
  }
  Vector < Integer > v = new Vector < > ( ) ;
  n = n - 1 ;
  while ( n > 0 ) {
    v . add ( n % 5 ) ;
    n = n / 5 ;
  }
  int result = 0 ;
  for ( int i = v . size ( ) - 1 ;
  i >= 0 ;
  i -- ) {
    result = result * 10 ;
    result = result + v . get ( i ) ;
  }
  return 2 * result ;
}

static int findNthEvenDigitNumber ( int n ) { if ( n == 1 ) { return 0 ; } Vector < Integer > v = new Vector < > ( ) ; n = n - 1 ; while ( n > 0 ) { v . add ( n % 5 ) ; n = n / 5 ; } int result = 0 ; for ( int i = v . size ( ) - 1 ; i >= 0 ; i -- ) { result = result * 10 ; result = result + v . get ( i ) ; } return 2 * result ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (return_statement (decimal_integer_literal)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))) (return_statement (binary_expression left: (decimal_integer_literal) right: (identifier)))))