什么是Java中的日期时间字段？

林译川

2026-10-03 • 👁 0人浏览过

时间字段是日期时间字段，例如一年中的月份或分钟中的小时。这些字段由 TemporalField 接口表示，ChronoField 类实现该接口。以下是 ChronoField 类支持的有关日期的各种时间字段的列表 - 字段描述ALIGNED_DAY_OF_WEEK_IN_MONTH该字段表示一个月中的星期几。ALIGNED_DAY_OF_WEEK_IN_YEAR立即学习“Java免费学习笔记（深入）”；此字段表示一年中一周的对齐日期。ALIGNED_WEEK_OF_MONTH此字段表示一个月的对齐周。ALIGNED_WEEK_OF_YEAR此字段表示对齐的周年。DAY_OF_MONTH此字段代表一个月中的第几天。DAY_OF_WEEK该字段代表一周中的某一天。DAY_OF_YEAR此字段代表一年中的第几天。EPOCH_DAY该字段代表一年中的纪元日。ERA该字段代表当年的时代。年份该字段代表年份。YEAR_OF_ERA该字段代表时代的年份。 LocalDate 和 LocaldateTime 类的 get() 或 getLong() 方法接受时间字段作为参数，并获取当前对象中给定字段的值。示例现场演示

import java.time.LocalDate;
import java.time.temporal.ChronoField;
public class Demo {
   public static void main(String args[]) {  
      //Instantiating the LocalDate class
      LocalDate lDate = LocalDate.now();
      int field = lDate.get(ChronoField.DAY_OF_MONTH);
      System.out.println("Day of the month: "+field);
      field = lDate.get(ChronoField.DAY_OF_WEEK);
      System.out.println("Day of the month: "+field);
      field = lDate.get(ChronoField.DAY_OF_YEAR);
      System.out.println("Day of the month: "+field);
      long epoch = lDate.getLong(ChronoField.EPOCH_DAY);
      System.out.println("Day of the month: "+epoch);
      field = lDate.get(ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH);
      System.out.println("Week in the month: "+field);
      field = lDate.get(ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR);
      System.out.println("Day of the week in an year: "+field);
      field = lDate.get(ChronoField.ERA);
      System.out.println("Era: "+field);
   }
}

输出

Day of the month: 11
Day of the month: 3
Day of the month: 316
Day of the month: 18577
Week in the month: 4
Day of the week in an year: 1
Era: 1

示例现场演示

import java.time.DayOfWeek;
import java.time.LocalTime;
import java.time.Month;
import java.time.Year;
import java.time.temporal.ChronoField;
public class Demo {
   public static void main(String args[]) {  
      //Instantiating the LocalDateTime class
      LocalTime lTime = LocalTime.now();
      System.out.println(lTime);  
      int field = Year.of(2019).get(ChronoField.YEAR);
      System.out.println("Year: "+field);  
      field = Month.of(8).get(ChronoField.MONTH_OF_YEAR);
      System.out.println("Year: "+field);  
      field = DayOfWeek.of(3).get(ChronoField.DAY_OF_WEEK);
      System.out.println("Year: "+field);  
   }
}

输出

20:01:43.171
Year: 2019
Year: 8
Year: 3

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