Java SimpleTimeZone setStartRule(int, int, int)方法及实例

Java中SimpleTimeZone类 的 setStartRule(int startofMonth , int startofDay , int startofTime)方法 用于将日光节约时间的特定开始规则设置为某个月内的固定日期。

语法

public void setStartRule(int startofMonth, 
                              int startofDay, 
                              int startofTime)

参数： 该方法需要三个参数。

• startofMonth : 这是一个整数类型的参数，指的是夏令时的起始月份。
• startofDay : 这是一个整数类型，指的是夏令时的起始日。
• startofTime : 这是一个整数类型，指的是夏令时的起始时间。

返回值： 该方法不返回任何值。

下面的程序说明了Java中setStartRule()方法的使用：
示例1 :

// Java code to demonstrate
// setStartRule() method
  
import java.util.*;
  
public class SimpleTimeZone_Demo {
    public static void main(String[] args)
    {
  
        // Creating SimpleTimeZone object
        SimpleTimeZone simtimeobj
            = new SimpleTimeZone(100, "GMT");
  
        // Displaying the Initial value
        System.out.println(
            "Initial value: " + simtimeobj);
  
        // Setting an StartRule
        simtimeobj.setStartRule(Calendar.APRIL,
                                28, 3600000);
  
        // Displaying the New value
        System.out.println(
            "New value: " + simtimeobj);
    }
}

输出:

Initial value: java.util.SimpleTimeZone[id=GMT, offset=100, dstSavings=3600000,
useDaylight=false, startYear=0, startMode=0, startMonth=0, startDay=0, startDayOfWeek=0,
startTime=0, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0, endTime=0,
endTimeMode=0]

New value: java.util.SimpleTimeZone[id=GMT, offset=100, dstSavings=3600000,
useDaylight=false, startYear=0, startMode=1, startMonth=3, startDay=28, startDayOfWeek=0,
startTime=3600000, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0,
endTime=0, endTimeMode=0]

例2 :

// Java code to demonstrate
// setStartRule() method
  
import java.util.*;
  
public class SimpleTimeZone_Demo {
    public static void main(String[] args)
    {
  
        // Creating SimpleTimeZone object
        SimpleTimeZone simtimeobj
            = new SimpleTimeZone(120, "GMT");
  
        // Displaying the Initial value
        System.out.println(
            "Initial value: " + simtimeobj);
  
        // Setting an StartRule
        simtimeobj.setStartRule(Calendar.JANUARY,
                                15, 3600000);
  
        // Displaying the New value
        System.out.println(
            "New value: " + simtimeobj);
    }
}

输出:

Initial value: java.util.SimpleTimeZone[id=GMT, offset=120, dstSavings=3600000,
useDaylight=false, startYear=0, startMode=0, startMonth=0, startDay=0, startDayOfWeek=0,
startTime=0, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0, endTime=0,
endTimeMode=0]

New value: java.util.SimpleTimeZone[id=GMT, offset=120, dstSavings=3600000,
useDaylight=false, startYear=0, startMode=1, startMonth=0, startDay=15, startDayOfWeek=0,
startTime=3600000, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0,
endTime=0, endTimeMode=0]

参考: https://docs.oracle.com/javase/10/docs/api/java/util/SimpleTimeZone.html#setStartRule(int,int,int)