getlong

LocalDateTime類的getLong()方法 (LocalDateTime 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 date-time object.

  getLong()方法用于從該日期時間對象獲取給定時間字段的值。

• 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()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• getLong() method may throw an exception at the time of returning value as long.

  只要返回值的時間長， getLong()方法就可能引發異常。

  • DateTimeException – This exception may throw when the given field couldn’t be generated.
  • UnsupportedTemporalTypeException – This exception may throw when the given field is unsupported.
  • ArithmeticException – This exception may throw when the calculated result exceeds the limit.

Syntax:

句法：

    public long getLong(TemporalField t_field);

Parameter(s):

參數：

• 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 for the given field as long from this date-time.

此方法的返回類型為long ，它從該日期時間開始一直返回給定字段的值。

Example:

例：

// Java program to demonstrate the example 
// of getLong(TemporalField t_field) method 
// of LocalDateTime
import java.time.*;
import java.time.temporal.*;
public class GetLongOfLocalDateTime {
public static void main(String args[]) {
// Instantiates two LocalDateTime
LocalDateTime da_ti1 = LocalDateTime.parse("2005-10-05T10:10:10");
LocalDateTime da_ti2 = LocalDateTime.now();
// Display da_ti1, da_ti2
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 returns the given 
// field value from this date-time (da_ti1)
// i.e. here MONTH_OF_YEAR field value will
// be returned from this date-time object
// da_ti1
long get_val = da_ti1.getLong(ChronoField.MONTH_OF_YEAR);
// Display get_val
System.out.print("da_ti1.getLong(ChronoField.MONTH_OF_YEAR): ");
System.out.println(get_val);
// Here, this method returns the given field
// value from this date-time (da_ti2) i.e. here
// MICRO_OF_SECOND field value will be returned
// from this date-time object da_ti2
get_val = da_ti2.getLong(ChronoField.MICRO_OF_SECOND);
// Display get_val
System.out.print("da_ti2.getLong(ChronoField.MICRO_OF_SECOND): ");
System.out.println(get_val);
}
}

Output

輸出量

LocalDateTime da_ti1 and da_ti2: 
da_ti1: 2005-10-05T10:10:10
da_ti2: 2020-06-05T03:01:53.798565da_ti1.getLong(ChronoField.MONTH_OF_YEAR): 10
da_ti2.getLong(ChronoField.MICRO_OF_SECOND): 798565

翻譯自: https://www.includehelp.com/java/localdatetime-getlong-method-with-example.aspx

getlong