Java中的 ZoneOffsetTransition getOffsetBefore() 方法示例

Java.time.zone.ZoneOffsetTransition类的getOffsetBefore()方法用于获取作为参数传递的第一个区域偏移对象的偏移值。

句法：

public ZoneOffset getOffsetBefore()

参数：此方法不接受任何参数。

返回值：此方法返回作为参数传递的第一个区域偏移对象的偏移值。

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
        // the object of LocalDateTime
        LocalDateTime loc
            = LocalDateTime.of(
                1999, 04, 25,
                03, 24, 45, 0);
  
        // creating and initializing
        // the object of ZoneOffset
        ZoneOffset off1
            = ZoneOffset.ofTotalSeconds(8);
  
        // creating and initializing
        // the object of ZoneOffset
        ZoneOffset off2
            = ZoneOffset.ofTotalSeconds(12);
  
        // creating and initializing
        // ZoneOffsetTransition Object
        ZoneOffsetTransition zonetrans1
            = ZoneOffsetTransition.of(
                loc, off1, off2);
  
        // getting the offset before value
        // by using getOffsetBefore() method
        ZoneOffset off
            = zonetrans1.getOffsetBefore();
  
        // display the result
        System.out.println(
            "Zoneoffset before transition : "
            + off);
    }
}

输出：

Zoneoffset before transition : +00:00:08

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
        // the object of LocalDateTime
        LocalDateTime loc
            = LocalDateTime.of(
                1999, 04, 25,
                03, 24, 45, 0);
  
        // creating and initializing
        // the object of ZoneOffset
        ZoneOffset off1
            = ZoneOffset.ofTotalSeconds(12);
  
        // creating and initializing
        // the object of ZoneOffset
        ZoneOffset off2
            = ZoneOffset.ofTotalSeconds(8);
  
        // creating and initializing
        // ZoneOffsetTransition Object
        ZoneOffsetTransition zonetrans1
            = ZoneOffsetTransition.of(
                loc, off1, off2);
  
        // getting the offset before value
        // by using getOffsetBefore() method
        ZoneOffset off
            = zonetrans1.getOffsetBefore();
  
        // display the result
        System.out.println(
            "Zoneoffset before transition : "
            + off);
    }
}

输出：

Zoneoffset before transition : +00:00:12

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