java timezone_Java TimeZone inDaylightTime（）方法及示例

java timezone

TimeZone类inDaylightTime()方法 (TimeZone Class inDaylightTime() method)

inDaylightTime() method is available in java.util package.
inDaylightTime()方法在java.util包中可用。
inDaylightTime() method is used to check whether the given date (d) is in daylight savings time (DST) or not in this TimeZone.
inDaylightTime()方法用于检查给定日期(d)是否在此TimeZone中处于夏时制(DST)中。
inDaylightTime() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
inDaylightTime()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
inDaylightTime() method does not throw an exception at the time of checking the date in daylight.
inDaylightTime()方法在白天检查日期时不会引发异常。

Syntax:

句法：

    public abstract boolean inDaylightTime(Date d);

Parameter(s):

参数：

Date d – represents the date.
日期d –表示日期。

Return value:

返回值：

The return type of the method is boolean, it returns true when the given date is DST (daylight savings time) otherwise it returns false.

该方法的返回类型为boolean ，当给定日期为DST(夏令时)时返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example 
// of boolean inDaylightTime(Date d)
// method of TimeZone 
import java.util.*;
public class InDaylightTimeOfTimeZone {
public static void main(String args[]) {
// Instantiates two TimeZone object
TimeZone tz1 = TimeZone.getTimeZone("Africa/Asmera");
TimeZone tz2 = TimeZone.getDefault();
Date d = new Date(2010, 02, 20);
// Display tz1 , tz1
System.out.println("tz1: " + tz1);
System.out.println("tz2: " + tz2);
// By using inDaylightTime() method is to
// check whether timezone is in daylight
// time or not
boolean status1 = tz1.inDaylightTime(d);
boolean status2 = tz2.inDaylightTime(d);
System.out.print("tz1.inDaylightTime(d): ");
System.out.println(status1);
System.out.print("tz1.inDaylightTime(d): ");
System.out.println(status2);
}
}

Output

输出量

tz1: sun.util.calendar.ZoneInfo[id="Africa/Asmera",offset=10800000,dstSavings=0,useDaylight=false,transitions=6,lastRule=null]
tz2: sun.util.calendar.ZoneInfo[id="GMT",offset=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null]
tz1.inDaylightTime(d): false
tz1.inDaylightTime(d): false