常用类06-JDK8中的时间API

JDK8中新日期时间API

• java.time

  包含值对象的基础包

• java.time.chrono

  提供对不同的日历系统的访问

• java.time.format

  格式化和解析时间和日期

• java.time.temporal

  包含底层框架和扩展特性

• java.time.zone

  包含时区支持的类

时间相关常用类

常用类：

• LocalDate类

• LocalTime类

• LocalDateTime类

  

方法：

• now()

  获取当前日期、时间、日期+时间

  LocalDate localDate = LocalDate.now();
  LocalTime localTime = LocalTime.now();
  LocalDateTime localDateTime = LocalDateTime.now();
  System.out.println(localDate);
  //2022-02-26
  System.out.println(localTime);
  //08:00:41.167
  System.out.println(localDateTime);
  //2022-02-26T08:00:41.167
  

• of()

  设置指定的年、月、日、时、分、秒，没有偏移量

  LocalDateTime localDateTime1 = LocalDateTime.of(2022, 1, 1, 12, 00, 00);
  System.out.println(localDateTime1);
  //2022-01-01T12:00
  

• getXxx()

  获取相关属性

  System.out.println(localDateTime.getDayOfMonth());
  System.out.println(localDateTime.getDayOfWeek());
  System.out.println(localDateTime.getMonth());
  System.out.println(localDateTime.getMonthValue());
  System.out.println(localDateTime.getMinute());
  //26
  //SATURDAY 
  //FEBRUARY
  //2
  //0
  

• withXxx()

  设置相关属性

  LocalDateTime localDateTime2 = localDateTime.withDayOfMonth(22);
  System.out.println(localDateTime);
  //2022-02-26T08:00:41.167
  System.out.println(localDateTime2);
  //2022-02-22T08:00:41.167
  

• plusXxx()

  //plusXxx()
  LocalDateTime localDateTime3 = localDateTime.plusMonths(3);
  System.out.println(localDateTime);
  System.out.println(localDateTime3);
  

• minusXxx()

  //minusXxx()
  LocalDateTime localDateTime4 = localDateTime.minusDays(6);
  System.out.println(localDateTime);
  System.out.println(localDateTime4);
  

说明：

1. LocalDateTime相较于LocalDate、LocalTime，使用频率要高

2. 类似于Calendar类