这里计算例如"Asia/Shanghai"与"Europe/London"之间的时间差，并以正负值表示。以下是一个示例代码：

import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.Duration;public class TimeZoneOffset {public static void main(String[] args) {// 定义"Europe/London"和"Asia/Shanghai"时区ZoneId londonZone = ZoneId.of("Europe/London");ZoneId shanghaiZone = ZoneId.of("Asia/Shanghai");// 获取两个时区的偏移ZoneRules londonRules = londonZone.getRules();ZoneRules shanghaiRules = shanghaiZone.getRules();ZoneOffset londonOffset = londonRules.getOffset(java.time.Instant.now());ZoneOffset shanghaiOffset = shanghaiRules.getOffset(java.time.Instant.now());// 计算两个偏移之间的小时差int offsetHours = (londonOffset.getTotalSeconds() - shanghaiOffset.getTotalSeconds()) / 3600;// 打印小时差（正负值表示）System.out.println("时区差：" + offsetHours + " 小时");}
}