java中get接口示例

即時類的get()方法 (Instant Class get() method)

• get() method is available in java.time package.

  get()方法在java.time包中可用。

• get() method is used to get the value of the given field from this Instant object.

  get()方法用于從此Instant對象獲取給定字段的值。

• get() 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.

  get()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。

• get() method may throw an exception at the time of returning value for the given field.

  在返回給定字段的值時， get()方法可能會引發異常。

  • DateTimeException: This exception may throw when the given field couldn’t be generated.DateTimeException ：當無法生成給定字段時，可能引發此異常。
  • UnsupportedTemporalTypeException: This exception may throw when the given field is unsupported.UnsupportedTemporalTypeException ：當不支持給定字段時，可能引發此異常。
  • ArithmeticException: This exception may throw when the calculated result exceeds the limit.ArithmeticException ：當計算結果超出限制時，可能引發此異常。

Syntax:

句法：

    public int get(TemporalField t_field);

Parameter(s):

參數：

• TemporalField t_field – represents the temporal field of the returned value.

  TemporalField t_field –表示返回值的時間字段。

Return value:

返回值：

The return type of this method is int, it returns the value for the given temporal field from this Instant.

此方法的返回類型為int ，它從此Instant返回給定時間字段的值。

Example:

例：

// Java program to demonstrate the example 
// of get(TemporalField t_field) method 
// of Instant
import java.time.*;
import java.time.temporal.*;
public class GetOfInstant {
public static void main(String args[]) {
// Instantiates two Instant
Instant ins1 = Instant.parse("2006-04-03T05:10:15.120Z");
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
int get_val = ins1.get(ChronoField.MICRO_OF_SECOND);
// Display get_val
System.out.println("ins1.get(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
get_val = ins2.get(ChronoField.MILLI_OF_SECOND);
// Display get_val
System.out.println("ins2.get(ChronoField.MILLI_OF_SECOND): " + get_val);
}
}

Output

輸出量

Instant ins1 and ins2: 
ins1: 2006-04-03T05:10:15.120Z
ins2: 2007-06-05T10:20:30.200Zins1.get(ChronoField.MICRO_OF_SECOND): 120000
ins2.get(ChronoField.MILLI_OF_SECOND): 200

翻譯自: https://www.includehelp.com/java/instant-get-method-with-example.aspx

java中get接口示例