Java中的 ZoneOffsetTransition isValidOffset() 方法及示例

Java.time.zone.ZoneOffsetTransition类的isValidOffset()方法用于检查特定区域偏移在转换期间是否有效。

句法：

public boolean isValidOffset(ZoneOffset offset)

参数：此方法用于将区域偏移对象的类型作为参数。

返回值：如果特定区域偏移在过渡期间有效或无效，则此方法返回 true，否则返回 false。

下面是说明isValidOffset()方法的示例：

示例 1：

// Java program to demonstrate
// isValidOffset() 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, 59, 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);
  
        // comparing both object using
        // isValidOffset() method
        boolean status
            = zonetrans1
                  .isValidOffset(
                      ZoneOffset
                          .ofTotalSeconds(24));
  
        // display the result
        if (status)
            System.out.println("zoneoffset is valid");
        else
            System.out.println("zoneoffset is invalid");
    }
}

输出：

zoneoffset is invalid

示例 2：

// Java program to demonstrate
// isValidOffset() 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, 59, 0);
  
        // creating and initializing
        // the object of ZoneOffset
        ZoneOffset off1
            = ZoneOffset.ofHoursMinutes(0, 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);
  
        // comparing both object using
        // isValidOffset() method
        boolean status
            = zonetrans1.isValidOffset(off1);
  
        // display the result
        if (status)
            System.out.println("zoneoffset is valid");
        else
            System.out.println("zoneoffset is invalid");
    }
}

输出：

zoneoffset is valid

输出：

zoneoffset is valid

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