Java中的 ZoneOffsetTransitionRule getOffsetBefore() 方法与示例

Java.time.zone.ZoneOffsetTransitionRule类的getOffsetBefore()方法用于在过渡开始的特定时刻获取Zone offset 的对象。

句法：

public ZoneOffset getOffsetBefore()

参数：此方法不接受任何参数。

返回值：此方法在过渡开始的特定时刻返回区域偏移的对象。

以下是说明getOffsetBefore()方法的示例：

示例 1：

// Java program to demonstrate
// getOffsetBefore() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.zone.*;
  
public class GFG {
    public static void main(String[] argv)
    {
  
        // creating and initializing
        // ZoneOffsetTransitionRule Object
        ZoneOffsetTransitionRule zonetrans1
            = ZoneOffsetTransitionRule
                  .of(
                      Month.JANUARY, 12,
                      DayOfWeek.SUNDAY,
                      LocalTime.of(03, 24, 45),
                      false,
                      ZoneOffsetTransitionRule
                          .TimeDefinition
                          .STANDARD,
                      ZoneOffset.ofTotalSeconds(8),
                      ZoneOffset.ofTotalSeconds(10),
                      ZoneOffset.ofTotalSeconds(12));
  
        // getting object of Zone offset
        // by using getOffsetBefore() method
        ZoneOffset off
            = zonetrans1.getOffsetBefore();
  
        // display the result
        System.out.println(
            "Zone Offset before : " + off);
    }
}

输出：

Zone Offset before : +00:00:10

示例 2：

// Java program to demonstrate
// getOffsetBefore() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.zone.*;
  
public class GFG {
    public static void main(String[] argv)
    {
  
        // creating and initializing
        // ZoneOffsetTransitionRule Object
        ZoneOffsetTransitionRule zonetrans1
            = ZoneOffsetTransitionRule
                  .of(
                      Month.JANUARY, 12,
                      DayOfWeek.SUNDAY,
                      LocalTime.of(03, 24, 45),
                      false,
                      ZoneOffsetTransitionRule
                          .TimeDefinition
                          .STANDARD,
                      ZoneOffset.ofTotalSeconds(8),
                      ZoneOffset.ofTotalSeconds(17),
                      ZoneOffset.ofTotalSeconds(12));
  
        // getting object of Zone offset
        // by using getOffsetBefore() method
        ZoneOffset off
            = zonetrans1.getOffsetBefore();
  
        // display the result
        System.out.println(
            "Zone Offset before : " + off);
    }
}

输出：

Zone Offset before : +00:00:17

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/zone/ZoneOffsetTransitionRule.html#getOffsetBefore-