final修飾,線程安全,用於打印和解析日期-時間對象的格式化程序。安全
建立DateTimeFormatter:spa
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.systemDefault());
例如:LocalDateTime線程
LocalDateTime localDateTime = LocalDateTime.now();
System.out.println(dateTimeFormatter.format(localDateTime));
輸出:2019-12-28 23:06:12code
例如:解析 "2019-12-28 23:06:12"orm
LocalDateTime localDateTime2 = LocalDateTime.parse("2019-12-28 23:06:12", dateTimeFormatter);
System.out.println("localDateTime2:"+dateTimeFormatter.format(localDateTime2));
輸出:localDateTime2:2019-12-28 23:06:12對象
例如:解析 "2019-12-28 23:06:12"blog
LocalDateTime localDateTime3 = LocalDateTime.from(dateTimeFormatter.parse("2019-12-28 23:06:12"));
System.out.println("localDateTime2:"+dateTimeFormatter.format(localDateTime3));
輸出:localDateTime3:2019-12-28 23:06:12it