关于java:java8的时间

一、java8之前的工夫
二、java8新增加的工夫
LocalDate
LocalTime
LocalDateTime
Instant
ZoneId
ZoneOffset
OffsetDateTime
ZonedDateTime

@Testpublic void localDateTime(){    LocalDateTime  dateTime = LocalDateTime.now(ZoneId.systemDefault());    //2022-04-24T17:30:58.264    System.out.println(dateTime);}@Testpublic void zonedDateTime(){    ZonedDateTime now = ZonedDateTime.now();    //2022-04-24T17:38:05.055+08:00[Asia/Shanghai]    System.out.println(now);    String newYork = "America/New_York";    ZonedDateTime newYorkTime = ZonedDateTime.of(now.toLocalDateTime(), ZoneId.of(newYork));    //2022-04-24T17:38:05.055-04:00[America/New_York]    System.out.println(newYorkTime);}@Testpublic void instanceToZonedDateTime(){    Instant now = Instant.now();    ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(now,ZoneId.systemDefault());    //2022-04-24T17:34:02.632+08:00[Asia/Shanghai]    System.out.println(zonedDateTime);    String newYork = "America/New_York";    ZonedDateTime newYorkTime = ZonedDateTime.ofInstant(now, ZoneId.of(newYork));    //2022-04-24T05:34:02.632-04:00[America/New_York]    System.out.println(newYorkTime);}@Testpublic void format(){    ZonedDateTime now = ZonedDateTime.now();    //2022-04-24T17:49:18.911    //2022-04-24T17:49:18.911+08:00[Asia/Shanghai]    //2022-04-24T17:49:18.911+08:00    System.out.println(now.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME));    System.out.println(now.format(DateTimeFormatter.ISO_ZONED_DATE_TIME));    System.out.println(now.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME));    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");    LocalDateTime time = LocalDateTime.of(2022, 04, 24, 17, 50, 50);    //2022/04/24 17:50:50    System.out.println(time.format(formatter));}@Testpublic void parse(){        //2022-04-24T17:49:18.911        //2022-04-24T17:49:18.911        //2022-04-24T17:49:18.911    System.out.println(LocalDateTime.parse("2022-04-24T17:49:18.911",DateTimeFormatter.ISO_LOCAL_DATE_TIME));    System.out.println(LocalDateTime.parse("2022-04-24T17:49:18.911+08:00[Asia/Shanghai]",DateTimeFormatter.ISO_ZONED_DATE_TIME));    System.out.println(LocalDateTime.parse("2022-04-24T17:49:18.911+08:00",DateTimeFormatter.ISO_OFFSET_DATE_TIME));    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");    String string = "2022/04/24 17:55:52";    //2022-04-24T17:55:52    System.out.println(LocalDateTime.parse(string,formatter));}