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: 2007-06-05T10:20:30.200Z

ins1.getLong(ChronoField.MICRO_OF_SECOND): 200000
ins2.getLong(ChronoField.MILLI_OF_SECOND): 200

翻译自: https://www.includehelp.com/java/instant-getlong-method-with-example.aspx

getlong