getlong_Java即时类| 带示例的getLong（）方法

getlong

即时类getLong()方法 (Instant Class getLong() method)

getLong() method is available in java.time package.
getLong()方法在java.time包中可用。
getLong() method is used to get the value as long for the given temporal field from this Instant.
getLong()方法用于从此Instant获取给定时间字段的值。
getLong() 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.
getLong()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。
getLong() method may throw an exception at the time of returning value as long.
只要返回值的时间长， getLong()方法就可能引发异常。
- DateTimeException: This exception may throw when the given field couldn't be generated.DateTimeException ：当无法生成给定字段时，可能引发此异常。
- UnsupportedTemporalTypeException: This exception may throw when the given field is unsupported.UnsupportedTemporalTypeException ：当不支持给定字段时，可能引发此异常。
- ArithmeticException: This exception may throw when the calculated result exceeds the limit.ArithmeticException ：当计算结果超出限制时，可能引发此异常。

Syntax:

句法：

    public long getLong(TemporalField t_field);

Parameter(s):

参数：

TemporalField t_field – represents the field of the returned value.
TemporalField t_field –代表返回值的字段。

Return value:

返回值：

The return type of this method is long, it returns the value of the given field in a long from this Instant.

此方法的返回类型是long ，它从此Instant返回long中给定字段的值。

Example:

例：

// Java program to demonstrate the example 
// of getLong(TemporalField t_field) method 
// of Instant
import java.time.*;
import java.time.temporal.*;
public class GetLongOfInstant {
public static void main(String args[]) {
// Instantiates two Instant
Instant ins1 = Instant.parse("2006-04-03T05:10:15.20Z");
Instant ins2 = Instant.parse("2007-06-05T10:20:30.20Z");
// Display ins1,ins2
System.out.println("Instant ins1 and ins2: ");
System.out.println("ins1: " + ins1);
System.out.println("ins2: " + ins2);
System.out.println();
// Here, this method gets the value of the 
// given field from this Instant i.e.
// here the MICRO_OF_SECOND field value
// will be returned from this Instant ins1
// as long
long get_val = ins1.getLong(ChronoField.MICRO_OF_SECOND);
// Display get_val
System.out.println("ins1.getLong(ChronoField.MICRO_OF_SECOND): " + get_val);
// Here, this method gets the value of the 
// given field from this Instant i.e.
// here the MILLI_OF_SECOND field value
// will be returned from this Instant ins2
// as long
get_val = ins2.getLong(ChronoField.MILLI_OF_SECOND);
// Display get_val
System.out.println("ins2.getLong(ChronoField.MILLI_OF_SECOND): " + get_val);
}
}

Output

输出量

Instant ins1 and ins2: 
ins1: 2006-04-03T05:10:15.200Z
ins2: 2007-06-05T10:20:30.200Zins1.getLong(ChronoField.MICRO_OF_SECOND): 200000
ins2.getLong(ChronoField.MILLI_OF_SECOND): 200