java 根据类名示例化类_Java LocalDateTime类| atOffset（）方法与示例

java 根据类名示例化类

LocalDateTime类atOffset()方法 (LocalDateTime Class atOffset() method)

atOffset() method is available in java.time package.
atOffset()方法在java.time包中可用。
atOffset() method is used to create an OffsetDateTime to merge this LocalDateTime with the given offset.
atOffset()方法用于创建OffsetDateTime，以将此LocalDateTime与给定的偏移量合并。
atOffset() 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.
atOffset()方法是一种非静态方法，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。
atOffset() method does not throw an exception at the time of representing LocalDateTime.
atOffset()方法在表示LocalDateTime时不会引发异常。

Syntax:

句法：

    public OffsetDateTime atOffset(ZoneOffset off);

Parameter(s):

参数：

ZoneOffset off – represents the zone offset to merge with this LocalDateTime.
ZoneOffset off –表示要与此LocalDateTime合并的区域偏移量。

Return value:

返回值：

The return type of this method is OffsetDateTime, it returns OffsetDateTime object that holds the value merged this LocalDateTime with the given offset.

此方法的返回类型为OffsetDateTime ，它返回OffsetDateTime对象，该对象包含将此LocalDateTime与给定的偏移量合并的值。

Example:

例：

// Java program to demonstrate the example 
// of atOffset(ZoneOffset off) method 
// of LocalDateTime
import java.time.*;
public class AtOffsetOfLocalDateTime {
public static void main(String args[]) {
// Instantiates two LocalDateTime
// and a ZonedOffset
LocalDateTime da_ti1 = LocalDateTime.parse("2005-10-05T10:10:10");
LocalDateTime da_ti2 = LocalDateTime.now();
ZoneOffset off = ZoneOffset.ofHoursMinutes(2, 2);
// Display da_ti1, da_ti2
// and off
System.out.println("LocalDateTime da_ti1 and da_ti2: ");
System.out.println("da_ti1: " + da_ti1);
System.out.println("da_ti2: " + da_ti2);
System.out.println();
// Here, this method creates an OffsetDateTime
// by merging this date-time (da_ti1) with
// the given offset (off) i.e. 
// da_ti1 + off(in hours , in minutes)
OffsetDateTime off_da_time = da_ti1.atOffset(off);
// Display updated off_da_time
System.out.println("da_ti1.atOffset(off): " + off_da_time);
// Here, this method creates an OffsetDateTime
// by merging this date-time (da_ti2) with
// the given offset (off) i.e. 
// da_ti2 + off(in hours)
off_da_time = da_ti2.atOffset(ZoneOffset.ofHours(4));
// Display updated off_da_time
System.out.print("da_ti2.atOffset(ZoneOffset.ofHours(4)): ");
System.out.println(off_da_time);
}
}

Output

输出量

LocalDateTime da_ti1 and da_ti2: 
da_ti1: 2005-10-05T10:10:10
da_ti2: 2020-06-04T08:02:20.579734da_ti1.atOffset(off): 2005-10-05T10:10:10+02:02
da_ti2.atOffset(ZoneOffset.ofHours(4)): 2020-06-04T08:02:20.579734+04:00