Java时间类、时间转换类的使用

public static void main(String[] args) {

        DateTimeFormatter dateTimeFormatter1 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

        DateTimeFormatter dateTimeFormatter2 = DateTimeFormatter.ofPattern("yyyy-MM-dd");

        DateTimeFormatter dateTimeFormatter3 = DateTimeFormatter.ofPattern("HH:mm:ss");

        LocalDateTime localDate1 = LocalDateTime.now();//年月日时分秒

        LocalDate localDate2 = LocalDate.now();//年月日

        LocalTime localDate3 = LocalTime.now();//时分秒

        System.out.println("年月日时分秒:"+dateTimeFormatter1.format(localDate1));

        System.out.println("年月日:"+dateTimeFormatter2.format(localDate2));

        System.out.println("时分秒:"+dateTimeFormatter3.format(localDate3));

    }